The document discusses how light and vision work, including:
1. Light travels in straight lines from a source and we only see light that enters our eyes.
2. White light is made up of different colors of light that can be separated using a prism.
3. Depth perception relies on the slight differences between images that enter each eye, allowing our brain to triangulate locations.
Article ii of the 1987 philippine state policies and principlesrheabeth razon
The document outlines the key policies and principles enshrined in Article II of the 1987 Philippine Constitution. It discusses how these provisions establish guidelines for the three branches of government and are generally not self-executing, requiring legislation. Some of the major policies covered include democracy, social justice, human rights, separation of church and state, foreign policy, and the roles of youth and women.
This document discusses the Catholic concept of faith. It defines faith as a personal response to God's revelation through Jesus Christ and the Catholic Church. Faith involves believing certain doctrines with the mind, trusting in God with the heart, and following God's commandments with the will. The document emphasizes that faith is both an individual act but also requires participation in the Christian community. It outlines various pressures on faith in modern society but asserts that lack of faith leads to negative consequences and a lack of moral guidance and meaningful worship.
The human skeleton is composed of 206 bones that provide structure, protect internal organs, allow for movement, and store minerals. There are 80 axial bones including the skull and vertebrae, and 126 appendicular bones such as the arms, legs, shoulders, and hips. Bones are living tissue composed of compact, cancellous, and subchondral bone tissues. The skeleton works with muscles to facilitate movement and provides anchors for muscles. Bones also serve important metabolic functions like mineral storage and blood cell production.
The document discusses the rules regarding the inventory and appraisal, allowances for the family, and a related case on these issues.
1) An executor or administrator must return an inventory and appraisal of the deceased's real and personal property within three months, excluding certain personal items for the surviving family.
2) During estate settlement, the widow and minor or incapacitated children shall receive allowances under the court's direction as provided by law.
3) In a related case, the court ruled that the guardianship court did not have authority to enforce payment of widow's allowance, as that power belongs to the court overseeing estate settlement.
The skeletal system consists of 206 bones and other tissues that provide structure, protect organs, allow movement, and produce blood cells. It includes two divisions - the axial skeleton which includes the skull, vertebral column, and thoracic cage, and the appendicular skeleton which includes the shoulder and pelvic girdles and upper and lower limbs. Bones are classified based on their shape as long, short, flat, or irregular. Joints connect bones and are classified as fibrous, cartilaginous, or synovial joints which allow different types of movement. Skeletal muscles contract through the sliding filament mechanism in response to neuronal signals at the neuromuscular junction.
In the most recent Hacker Intelligence Initiative report, Imperva analyses vulnerabilities found in the SuperGlobal parameters of the PHP platform, and finds that a multi-step attack requires a multi-layered application security solution.
Article ii of the 1987 philippine state policies and principlesrheabeth razon
The document outlines the key policies and principles enshrined in Article II of the 1987 Philippine Constitution. It discusses how these provisions establish guidelines for the three branches of government and are generally not self-executing, requiring legislation. Some of the major policies covered include democracy, social justice, human rights, separation of church and state, foreign policy, and the roles of youth and women.
This document discusses the Catholic concept of faith. It defines faith as a personal response to God's revelation through Jesus Christ and the Catholic Church. Faith involves believing certain doctrines with the mind, trusting in God with the heart, and following God's commandments with the will. The document emphasizes that faith is both an individual act but also requires participation in the Christian community. It outlines various pressures on faith in modern society but asserts that lack of faith leads to negative consequences and a lack of moral guidance and meaningful worship.
The human skeleton is composed of 206 bones that provide structure, protect internal organs, allow for movement, and store minerals. There are 80 axial bones including the skull and vertebrae, and 126 appendicular bones such as the arms, legs, shoulders, and hips. Bones are living tissue composed of compact, cancellous, and subchondral bone tissues. The skeleton works with muscles to facilitate movement and provides anchors for muscles. Bones also serve important metabolic functions like mineral storage and blood cell production.
The document discusses the rules regarding the inventory and appraisal, allowances for the family, and a related case on these issues.
1) An executor or administrator must return an inventory and appraisal of the deceased's real and personal property within three months, excluding certain personal items for the surviving family.
2) During estate settlement, the widow and minor or incapacitated children shall receive allowances under the court's direction as provided by law.
3) In a related case, the court ruled that the guardianship court did not have authority to enforce payment of widow's allowance, as that power belongs to the court overseeing estate settlement.
The skeletal system consists of 206 bones and other tissues that provide structure, protect organs, allow movement, and produce blood cells. It includes two divisions - the axial skeleton which includes the skull, vertebral column, and thoracic cage, and the appendicular skeleton which includes the shoulder and pelvic girdles and upper and lower limbs. Bones are classified based on their shape as long, short, flat, or irregular. Joints connect bones and are classified as fibrous, cartilaginous, or synovial joints which allow different types of movement. Skeletal muscles contract through the sliding filament mechanism in response to neuronal signals at the neuromuscular junction.
In the most recent Hacker Intelligence Initiative report, Imperva analyses vulnerabilities found in the SuperGlobal parameters of the PHP platform, and finds that a multi-step attack requires a multi-layered application security solution.
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help protect against mental illness and improve symptoms for those who already suffer from conditions like anxiety and depression.
Digital Media & Learning Conference Talk: Kids Teaching Kids Web Design at a ...Jacqueline Vickery
Presented at the Digital Media & Learning conference in Boston, MA. The talk focuses on a web design workshop for kids at a public library. How can web design change discourses of technology and computers and help kids develop literacies for meaningful participation?
Este documento fornece uma introdução ao PHP, incluindo:
1) Uma breve história do PHP e suas aplicações;
2) Exemplos básicos de código PHP com variáveis, loops, condicionais e arrays;
3) Introdução ao uso de GET, POST e SESSION para processamento de dados.
This document discusses third party patches for MySQL that provide quick wins and new features. It summarizes five such patches: 1) Slow query filtering which helps identify expensive queries, 2) Index statistics which helps determine unused indexes, 3) An InnoDB dictionary limit which constrains memory usage, 4) A global long query time setting, and 5) A "fix" for InnoDB group commit performance regressions in MySQL 5.0. The document encourages using third party patches to gain features and improvements not yet available in the MySQL core.
Prezi vom SEO/ecommerce Workshop der Hotelfachschule Hamburg, Januar 2015.
Themen:
Google Suche
Reisestudien digitales Marketing 2014
SEO Onpage
Mobile Marketing
Mobile Check in with Keyroom App
Customer Journey Mapping
Landingpage
Content Marketing
Die perfekte Hotelwebsite
Digital Media & Youth Safety - Ricky Lewis & Jacqueline VickeryJacqueline Vickery
This document discusses various aspects of internet and social media literacy. It defines social literacy as understanding how to operate successfully in social environments. Network literacy refers to effectively spreading one's own ideas through social networks. Expanding digital literacy is important so people can use digital media to enhance learning and civic engagement. The document emphasizes balancing risks and harms of technology with strategies facilitated by engaged adults and developing multiple literacies.
O documento discute os efeitos do ruído excessivo na saúde e o tratamento acústico de ambientes. Ele explica que ruídos acima de certos níveis podem causar danos auditivos e problemas de saúde a longo prazo, e destaca soluções como forros e paredes com materiais absorvedores de som para melhorar o conforto acústico em salas de aula, residências e outros espaços.
This song expresses gratitude for various aspects of nature like the sun, clouds, wind, birds, moon, stars, as well as feelings within oneself and other people. It thanks God or a higher power for animals, land, and people everywhere. The repetitive lyrics of "Thanks a lot" emphasize being thankful for all things both big and small.
This document discusses sharding architectures for scaling databases and applications. Sharding involves splitting data across multiple databases to improve performance and allow parallelization. The key aspects covered include:
1. The problem sharding aims to address is scalability for applications with high read/write traffic and large amounts of data.
2. Sharding is described and distinguished from replication/backup/clustering approaches.
3. Implementation involves splitting tables or data by identifier and distributing them across database shards using a technique like modulo.
4. Optimization strategies are discussed like caching, connection pooling, and using aggregation daemons to coordinate shards.
5. Challenges with joins, relations, and migrating
Here are some strategies for how to evaluate:
- Identify premises and conclusions
- Examine evidence and support
- Consider alternative viewpoints
- Check for bias or assumptions
- Evaluate logic and reasoning
- Assess significance and implications
- Make a judgment based on criteria
The key is to thoughtfully analyze the argument and make an informed evaluation, not just an opinion. Consider multiple perspectives.
This document discusses local file inclusion (LFI) and remote file inclusion (RFI) vulnerabilities. LFI occurs when a web application includes local files specified by the user through parameters, allowing execution of arbitrary code. RFI is similar but allows inclusion of remote files through URLs. Exploitation techniques discussed include using wrappers and filters to bypass protections, uploading files containing PHP code, and accessing log and session files.
There are several types of light emission including incandescence from hot objects, luminescence without heating, and electric discharge through gases. The document then discusses how light travels in straight lines from an object to the eye, and how our eyes and brain work together (the eye-brain) to see light entering from our surroundings. It explains key concepts of light including reflection, spectra, wavelengths, and different parts of the electromagnetic spectrum beyond just visible light.
This document discusses light sources and how light travels. The main points are:
- The sun is our primary natural light source. Other light sources can be natural or man-made. The moon, water, and mirrors are not true light sources as they only reflect light.
- Light travels in straight lines. When it hits an opaque object, some light is absorbed and the rest is reflected. Transparent objects allow light to pass through, while translucent objects let some light pass through and reflect the rest.
- For us to see, light enters the eye and is focused on the retina. The retina sends this visual information to the brain via the optic nerve to be interpreted. Color is the result of
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help protect against mental illness and improve symptoms for those who already suffer from conditions like anxiety and depression.
Digital Media & Learning Conference Talk: Kids Teaching Kids Web Design at a ...Jacqueline Vickery
Presented at the Digital Media & Learning conference in Boston, MA. The talk focuses on a web design workshop for kids at a public library. How can web design change discourses of technology and computers and help kids develop literacies for meaningful participation?
Este documento fornece uma introdução ao PHP, incluindo:
1) Uma breve história do PHP e suas aplicações;
2) Exemplos básicos de código PHP com variáveis, loops, condicionais e arrays;
3) Introdução ao uso de GET, POST e SESSION para processamento de dados.
This document discusses third party patches for MySQL that provide quick wins and new features. It summarizes five such patches: 1) Slow query filtering which helps identify expensive queries, 2) Index statistics which helps determine unused indexes, 3) An InnoDB dictionary limit which constrains memory usage, 4) A global long query time setting, and 5) A "fix" for InnoDB group commit performance regressions in MySQL 5.0. The document encourages using third party patches to gain features and improvements not yet available in the MySQL core.
Prezi vom SEO/ecommerce Workshop der Hotelfachschule Hamburg, Januar 2015.
Themen:
Google Suche
Reisestudien digitales Marketing 2014
SEO Onpage
Mobile Marketing
Mobile Check in with Keyroom App
Customer Journey Mapping
Landingpage
Content Marketing
Die perfekte Hotelwebsite
Digital Media & Youth Safety - Ricky Lewis & Jacqueline VickeryJacqueline Vickery
This document discusses various aspects of internet and social media literacy. It defines social literacy as understanding how to operate successfully in social environments. Network literacy refers to effectively spreading one's own ideas through social networks. Expanding digital literacy is important so people can use digital media to enhance learning and civic engagement. The document emphasizes balancing risks and harms of technology with strategies facilitated by engaged adults and developing multiple literacies.
O documento discute os efeitos do ruído excessivo na saúde e o tratamento acústico de ambientes. Ele explica que ruídos acima de certos níveis podem causar danos auditivos e problemas de saúde a longo prazo, e destaca soluções como forros e paredes com materiais absorvedores de som para melhorar o conforto acústico em salas de aula, residências e outros espaços.
This song expresses gratitude for various aspects of nature like the sun, clouds, wind, birds, moon, stars, as well as feelings within oneself and other people. It thanks God or a higher power for animals, land, and people everywhere. The repetitive lyrics of "Thanks a lot" emphasize being thankful for all things both big and small.
This document discusses sharding architectures for scaling databases and applications. Sharding involves splitting data across multiple databases to improve performance and allow parallelization. The key aspects covered include:
1. The problem sharding aims to address is scalability for applications with high read/write traffic and large amounts of data.
2. Sharding is described and distinguished from replication/backup/clustering approaches.
3. Implementation involves splitting tables or data by identifier and distributing them across database shards using a technique like modulo.
4. Optimization strategies are discussed like caching, connection pooling, and using aggregation daemons to coordinate shards.
5. Challenges with joins, relations, and migrating
Here are some strategies for how to evaluate:
- Identify premises and conclusions
- Examine evidence and support
- Consider alternative viewpoints
- Check for bias or assumptions
- Evaluate logic and reasoning
- Assess significance and implications
- Make a judgment based on criteria
The key is to thoughtfully analyze the argument and make an informed evaluation, not just an opinion. Consider multiple perspectives.
This document discusses local file inclusion (LFI) and remote file inclusion (RFI) vulnerabilities. LFI occurs when a web application includes local files specified by the user through parameters, allowing execution of arbitrary code. RFI is similar but allows inclusion of remote files through URLs. Exploitation techniques discussed include using wrappers and filters to bypass protections, uploading files containing PHP code, and accessing log and session files.
There are several types of light emission including incandescence from hot objects, luminescence without heating, and electric discharge through gases. The document then discusses how light travels in straight lines from an object to the eye, and how our eyes and brain work together (the eye-brain) to see light entering from our surroundings. It explains key concepts of light including reflection, spectra, wavelengths, and different parts of the electromagnetic spectrum beyond just visible light.
This document discusses light sources and how light travels. The main points are:
- The sun is our primary natural light source. Other light sources can be natural or man-made. The moon, water, and mirrors are not true light sources as they only reflect light.
- Light travels in straight lines. When it hits an opaque object, some light is absorbed and the rest is reflected. Transparent objects allow light to pass through, while translucent objects let some light pass through and reflect the rest.
- For us to see, light enters the eye and is focused on the retina. The retina sends this visual information to the brain via the optic nerve to be interpreted. Color is the result of
This document discusses light sources and how light travels. The main points are:
- The sun is our primary natural light source. Other light sources can be natural or man-made. The moon, water, and mirrors are not true light sources as they only reflect light.
- Light travels in straight lines. When it hits an opaque object, some light is absorbed and the rest is reflected. Transparent objects allow light to pass through, while translucent objects let some light pass through and reflect the rest.
- For us to see, light enters the eye and is focused on the retina. The retina sends this visual information to the brain via the optic nerve to be interpreted. Color is the result of
This document discusses light sources and how light travels. The main natural light source is the sun. Light travels in straight lines and can be reflected, absorbed, or pass through materials. For vision, light enters the eye and is processed by the brain to interpret what is seen based on patterns of light and dark or color. Shadows form when light is blocked by an opaque object. The position of the sun throughout the day affects the length and direction of shadows.
This document discusses light sources and how light travels. The main natural light source is the sun. Light travels in straight lines and can be reflected, absorbed, or pass through materials. For vision, light enters the eye and is processed by the brain to interpret what is seen based on patterns of light and dark, color, and movement. Color is the result of which wavelengths of light are reflected or absorbed by an object. Shadows form when light is blocked by an opaque object. The position of the sun causes shadows to change positions and lengths throughout the day.
The document discusses light sources and how light travels. The major natural light source is the sun. Light travels in straight lines and can be reflected, absorbed, or pass through objects. It is reflected off opaque objects, absorbed by some objects, and passes through transparent or translucent objects. The eyes see light that enters through the cornea and is focused on the retina, where light information is sent to the brain to be interpreted as vision. Shadows are formed when light is blocked by opaque objects. The position of the sun affects the length and location of shadows outside.
Slide that I created to support teaching science to my lower secondary student (Grade 7). The topic is Ray Model of Light. Some contents (pics and videos) are not mine. Hope it is useful for all teacher around the globe.
Light comes primarily from the sun. It can also come from both natural sources like the moon as well as man-made artificial sources. Objects like the moon, water, and mirrors are not true light sources as they only reflect light emitted from other sources. Light travels in straight lines and can pass through transparent materials, some can pass through translucent materials, and light cannot pass through opaque objects. The way we see color is determined by which wavelengths of light are reflected or absorbed by an object. Shadows form when light rays are blocked by an opaque object. When light passes from one medium to another, such as from air to water, it changes direction in a process called refraction.
Light comes primarily from the sun. It can also come from other natural sources like the moon or man-made sources like lamps. The moon and mirrors do not produce their own light but reflect light from other sources.
Light travels in straight lines and can pass through transparent materials, pass through translucent materials partially, or be blocked by opaque materials. The way light interacts with objects determines whether they appear colored or form shadows. Reflection and refraction explain how light bends when moving between different materials like air and water.
Light comes primarily from the sun. It can also come from other natural sources like the moon or man-made sources like lamps. The moon and mirrors do not produce their own light but reflect light from other sources.
Light travels in straight lines and can pass through transparent materials, pass through translucent materials partially, or be blocked by opaque materials. The way light interacts with objects determines whether they appear colored or form shadows. Reflection and refraction explain how light bends when moving between different materials like air and water.
Here are explanations for your questions:
The light from the sun contains all the colors of the visible spectrum, whereas the light from the moon is reflected sunlight, so it appears white. An orange looks orange because it absorbs all colors of light except orange, which it reflects. The sun appears to rise in the east and set in the west because of the Earth's rotation. As the Earth spins on its axis, different parts are exposed to the sun, making it look like the sun is moving across the sky. We can't see anything without a light source because our eyes need light to bounce off objects in order to see their shape, color, and details. A periscope works by using two mirrors to redirect the light path -
In physics, the term light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not. ... Like all types of EM radiation, visible light propagates as waves. However, the energy imparted by the waves is absorbed at single locations the way particles are absorbed.
The Physics of Light, ssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssssss
1. Light travels in straight lines and can be reflected or refracted. Reflection occurs when light bounces off a surface, while refraction is when light changes speed and direction when passing through different materials.
2. Mirrors come in different shapes that determine whether images are virtual or real, and lenses use refraction to bend light and form images. Concave lenses form virtual images while convex lenses form real images.
3. White light is composed of all visible wavelengths combined, and different materials reflect or absorb particular wavelengths, determining their perceived color. Color mixing with light follows the same principles as mixing with pigments. Filters can be used to selectively transmit or block certain wavelengths of light.
The document provides information about light and how it interacts with the human eye. It discusses that light is a form of electromagnetic radiation that can be detected by sight. It then explains the three ways light can interact with objects: forming shadows through blocking, reflecting through mirrors, and refracting when passing through different densities. The document also discusses lenses, the spectrum of colors, and how light travels through the eye and triggers impulses to the brain. It includes diagrams of the eye anatomy and different eye conditions.
Light is a type of electromagnetic radiation that includes visible light as well as other wavelengths such as radio waves, microwaves, and X-rays. Electromagnetic waves propagate through space as oscillating electric and magnetic fields and do not require a medium. They are emitted by electrons and consist of packets of energy called photons. The speed of light in a vacuum is approximately 300 million meters per second. Objects appear colored because they selectively absorb and reflect different wavelengths of visible light.
The document discusses various properties of light including:
- Light travels in a straight line at a speed of 3 x 10^8 m/s in a vacuum.
- Light reflects off surfaces, refracts by bending when passing between different mediums, and diffracts by bending around corners of openings.
- Interference occurs when light beams meet, resulting in constructive or destructive interference.
- Light exhibits wave-particle duality, acting as either a wave or particle depending on how it is observed.
In physics, the term light sometimes refers to electromagnetic radiation of any wavelength, whether visible or not. ... Like all types of EM radiation, visible light propagates as waves. However, the energy imparted by the waves is absorbed at single locations the way particles are absorbed.
This document provides an overview of light and vision. It defines luminous and non-luminous objects, and explains that light reflects off of non-luminous objects allowing us to see them. Reflection of light is demonstrated using a ray box experiment. The document also describes the anatomy of the human eye, including the iris, pupil, retina, and lens. It explains how the eye focuses on near and far objects by changing the thickness of the lens. Common vision defects like myopia and hyperopia are also outlined.
Here is the updated list of Top Best Ayurvedic medicine for Gas and Indigestion and those are Gas-O-Go Syp for Dyspepsia | Lavizyme Syrup for Acidity | Yumzyme Hepatoprotective Capsules etc
Histololgy of Female Reproductive System.pptxAyeshaZaid1
Dive into an in-depth exploration of the histological structure of female reproductive system with this comprehensive lecture. Presented by Dr. Ayesha Irfan, Assistant Professor of Anatomy, this presentation covers the Gross anatomy and functional histology of the female reproductive organs. Ideal for students, educators, and anyone interested in medical science, this lecture provides clear explanations, detailed diagrams, and valuable insights into female reproductive system. Enhance your knowledge and understanding of this essential aspect of human biology.
share - Lions, tigers, AI and health misinformation, oh my!.pptxTina Purnat
• Pitfalls and pivots needed to use AI effectively in public health
• Evidence-based strategies to address health misinformation effectively
• Building trust with communities online and offline
• Equipping health professionals to address questions, concerns and health misinformation
• Assessing risk and mitigating harm from adverse health narratives in communities, health workforce and health system
Muktapishti is a traditional Ayurvedic preparation made from Shoditha Mukta (Purified Pearl), is believed to help regulate thyroid function and reduce symptoms of hyperthyroidism due to its cooling and balancing properties. Clinical evidence on its efficacy remains limited, necessitating further research to validate its therapeutic benefits.
9. We don’t see light directed away from our eyes unless it is reflected into our Eye-Brain by something.
10. On diagrams in this unit, we will tend to ignore all light that does not enter our Eye-Brains.
11. The path light takes is called a Ray . Diagrams that show how light moves from the object to the eye are called Ray Diagrams.
12. Light is a type of energy our eyes are sensitive to. This is called an Operational definition because it only tells us how we detect light but it does not tell us what light is.
14. Light travels in straight lines. This is called Rectilinear Propagation . Since no ray of light can go straight from the Eye-Brain’s feet into your eyes, you can’t see them. Experience has trained our Eye-Brain to expect that things are located in the direction that the light comes from.
15.
16. Newton was the first to note that white light breaks into the colours of a rainbow when it passes through a prism. These colours are called a Spectrum.
17. When light from the Sun (White Light) is broken down, it’s Spectrum looks like this. White Light is made up of shades of Red, Orange, Yellow, Green, Blue, and Violet. A mnemonic for remembering the order of rainbow colours is the name Roy G Biv.
18. When light from some sources is broken down, it’s Spectrum looks like a series of lines. All spectrum can be further separated until they appear as a series of lines. The above Line Spectrum is from light coming from an iron heated until it gives off light. Most light sources are made up of many different colours.
19. Newton noted that the individual coloured lines could not be separated further. These lines are pure colours and are identified by a frequency and wavelength number .
20. A Conceptual definition gives a better understanding of what light is. The atoms in sources that produce light are surrounded by electrons that can be excited to higher energy levels. As these electrons fall back to their original energy level, they give off the energy in the form of light.
21. There are many different ways for electrons to fall back. Each jump backdown produces a different coloured line of light. The Conceptual definition of light is; Light is produced when electrons change energy levels.
22. There are many ways for atoms to gain energy. For instance, Incandescence is the emission of light from a body due to its temperature. The atoms gain energy by being heated.
23. Our ears cannot hear some high sound frequencies that dogs can. Similarly, our eyes cannot “see” some of the colours of light.
24. For instance, you cannot see if an iron is hot or not. Our eyes are not sensitive to the “colour” the iron emits but our hands can feel it. The “colour” hot irons emit is called Infra Red Radiation. Some snakes can see Infra Red Radiation.
25. Similarly, you cannot see water heating in a microwave oven. Our eyes are not sensitive to the “colour” the water can absorb. The “colour” that water is heated by is called Microwave Radiation.
26. The Visible Light Spectrum is a very small part of a much larger spectrum called the Electromagnetic Spectrum.
27. Mnemonics for Remembering the Electromagnetic Spectrum from Long to Short Wavelength My Favourite from Short to Long Wavelength Radio Waves Microwaves Infra Red Visible Spectrum Ultra Violet X-Rays Gamma Rays Raul's Mother Is Visiting Uncle Xavier's Garden Rabbits Mate In Very Unusual eXpensive Gardens Raging Martians Invade Roy G. Biv. Using X-rays & Gamma Rays Gamma Rays X-Rays Ultra Violet Visible Spectrum Infra Red Microwaves Radio Waves Girls/Guys eXperience Unusual Vibrations In My Room
28. Visible Light can be produced from many energy sources. Astronomical objects, Bioluminescences, Triboluminescence, Chemoluminescence, Fluorescence, Phosphorescence, Incandescent, Combustion, and Light-emitting diode are types of Luminous sources .
29. Atoms in Luminous Objects emit light rays in all directions produced from other energy sources.
30. Atoms in Non-Luminous Objects scatter the light rays from Luminous Objects in all directions.
31. Atoms in all objects produce or scatter light rays. This diagram only shows light rays from atoms at the top and bottom of the objects.
32. To make diagrams simpler we only show one ray of light from the top and bottom of objects. Rays illuminating Non-Luminous objects are not shown.
33. To make things even simpler, we sometimes only show the rays coming from the top of the object. We always only show the light rays that enter the observer’s eye.
34. Rays of light travel from the object to the observer’s eye through a Medium . A Transparent Medium allows nearly all the rays to pass straight through unaltered. Air is a transparent medium.
35. An Opaque Medium absorbs or scatters all the rays. A text book is an opaque medium.
36. A Translucent Medium transmits and scatters the rays. The medium indicates whether it is being illuminated but the object cannot be clearly seen. Wax paper is a translucent medium.
37. On a ray diagram, the Object’s Location or Distance from the Eye-Brain is where all light rays appear to originate or come from.
38. To make the ray diagram simpler, we often only use one ray entering the eye. In this case, the Object’s Location or Distance from the Eye-Brain is where all rays originate if the eye changes position.
39. Two eyes in front of a head can determine the object’s location better because the rays entering each eye can be used by the Eye-Brain to triangulate where the object is. This is called Depth Perception. Try the Pencil Touch Activity
40.
41. Floating Finger Did you see a piece of finger floating in the air? Explanation: The eyes are focused on a point located far away. The Eye-Brain uses two slightly different sets of rays to triangulate the distance. But we still see objects that are closer to the eyes.
42. The image from the left eye and the image in the right eye are combined in our brain. We see the overlap finger. The overlap is seen more clearly because it is seen by both eyes. You cannot see the floating piece of finger with one eye closed. We are not able to see depth well with only one eye. If we use only one eye, image depth can only be determined by their relative size. Left Eye Image
43. The image from the left eye and the image in the right eye are combined in our brain. We see the overlap finger. The overlap is seen more clearly because it is seen by both eyes. You cannot see the floating piece of finger with one eye closed. We are not able to see depth well with only one eye. If we use only one eye, image depth can only be determined by their relative size. Right Eye Image
44. The image from the left eye and the image in the right eye are combined in our brain. We see the overlap finger. The overlap is seen more clearly because it is seen by both eyes. You cannot see the floating piece of finger with one eye closed. We are not able to see depth well with only one eye. If we use only one eye image depth can only be determined by their relative size. Images from Both Eyes combined in the brain
45. The effect of two eyes on depth perception of the Eye-Brain is also used in Magic Eye or Random Dot pictures.
46. The apparent Size of the object depends on the angle between rays coming from the top and bottom of the object. Large objects have a large angle between the rays.
47. Objects that are farther away have a small angle between rays coming from the top and bottom. This makes them appear small to the Eye-Brain Objects that are close have a large angle between the rays, and the object appears larger.
48. If the Eye-Brain is confused about the location of the objects, then the object’s apparent size ( dotted shapes) can be confused. The Eye-Brain may assume both objects are at the same distance. Then the distant object looks small compared to the close object.
49. Animals with eyes on the side of their heads can only see the object with one eye at a time. They cannot use the triangulation method to determine the object’s location. These animals must use the object’s apparent size to determine its location. Their depth perception will be poor.
50. The Moon Illusion is an optical illusion in which the Moon appears larger when it is near the horizon than it does when it is higher up in the sky.
51. One of the possible explanations of the Moon Illusion is that the eye is confused about the location of the moon and surrounding objects. Therefore, the apparent size is confused.
Editor's Notes
Somewhere between a quarter and a third of humans’ neocortex is devoted to vision. We are very good at recognizing and distinguishing fairly subtle patterns, quickly decoding printed pages, for example, or distinguishing between trees based on the pattern of their leaves or bark. We accomplish this by having a very flexible and powerful visual system.
Music to the deaf is like colour to the blind. How we see things depends on how our senses perceive things in the physical world and how our brain interprets what our senses perceive. In order to understand sight, we first have to understand what we call light in the physical world. We also have to understand how our eyes and brain work. This course will concentrate mostly on how light behaves in the physical world. The study of this is called Optics.
You may wish to delete these slides if you do not have this Hologram. It’s wonderful how a hologram can be turned into an interest-generating button by gluing it onto any existing button. It is available at http://www.holoshop.com/catalog/display_item.asp?id=2 Viewed from different angles, it demonstrates that understanding sight requires: ● understanding light (the Hologram itself) ● understanding the eye / brain (the different views of the Hologram)
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Open the applet MAESpiral.swf (included with permission in this folder) in a browser, if your internet connection is slow. Or go to http://www.michaelbach.de/ot/mot_adaptSpiral/index.html Instructions on how to adjust is in the Materials / Teacher Guide document. Stand beside the projected image and have the class stare at the centre of the rotating spiral for about 20 seconds. Then have them look at your face. They will notice your head either growing larger or shrinking, depending on the direction of rotation. Don't worry, it won't last. The sensation will go away after a few seconds. It demonstrates that understanding sight requires understanding the brain. Then reverse the direction and repeat. Further explanations are on the bottom of the page.
Eye-Brain graphics are by Patrick McWade < [email_address] .com > Used with permission
Demonstrate that we can’t see the light that does not enter our eyes by using a laser pointer. Direct the laser beam across the classroom. Make the beam visible by misting water over the beam with a hand-held atomizer. As the tiny drops of water fall through the beam, they scatter light into the students’ eyes. This is called the Tyndall Effect. The Tyndall Effect is caused by reflection of light by very small particles in suspension in a transparent medium. It is often seen from the dust in the air when sunlight comes in through a window, or comes down through holes in clouds.
Demonstrate that we can’t see the light that does not enter our eyes by using a laser pointer. Direct the laser beam across the classroom. Make the beam visible by misting water over the beam with a hand-held atomizer. As the tiny drops of water fall through the beam, they scatter light into the students’ eyes. This is called the Tyndall Effect. The Tyndall Effect is caused by reflection of light by very small particles in suspension in a transparent medium. It is often seen from the dust in the air when sunlight comes in through a window, or comes down through holes in clouds.
Demonstrate that we can’t see the light that does not enter our eyes by using a laser pointer. Direct the laser beam across the classroom. Make the beam visible by misting water over the beam with a hand-held atomizer. As the tiny drops of water fall through the beam, they scatter light into the students’ eyes. This is called the Tyndall Effect. The Tyndall Effect is caused by reflection of light by very small particles in suspension in a transparent medium. It is often seen from the dust in the air when sunlight comes in through a window, or comes down through holes in clouds.
Demonstrate that we can’t see the light that does not enter our eyes by using a laser pointer. Direct the laser beam across the classroom. Make the beam visible by misting water over the beam with a hand-held atomizer. As the tiny drops of water fall through the beam, they scatter light into the students’ eyes. This is called the Tyndall Effect. The Tyndall Effect is caused by reflection of light by very small particles in suspension in a transparent medium. It is often seen from the dust in the air when sunlight comes in through a window, or comes down through holes in clouds.
Rectilinear Propagation
Rectilinear Propagation
Rectilinear Propagation
Rectilinear Propagation
Sir Isaac Newton’s full name with title is easy to remember because of his initials (i.e. SIN).
Very good full spectrum from overhead projector – Fisher Science Education http://www.fishersci.com/wps/portal/CMSTATIC?href=index.jsp&store=ScienceEducation&segment=scienceEduStandard&tabClicked=1 - Diffraction Grating 6x5 Roll for overhead projector S425442 Science First No.:PS-08-B Encourage students to make up their own mnemonic for remembering the order of rainbow colours. Let them know “ A mnemonic is just a way to remember simple lists ” . To show students a very good full spectrum see http://isaac.exploratorium.edu/~pauld/summer_institute/summer_day6color/color_diffraction_grating.html Note the Capital letters denote the Additive Primary colours. More on this later in “ Seeing Colour.ppt ” Isaac Newton named the colours of the spectrum that we use today. At first, he only identified 5 colours (red, yellow, green, blue, violet). He changed this to seven colours out of a mistaken belief, derived from the ancient Greeks. They believed there was a connection between the colours, the musical notes, the known objects in the solar system, and the days of the week. Newton, therefore, added Orange and Indigo to make up 7 names for the main colours of the spectrum, i.e., ROYGBIV, Red, Orange, Yellow, Green, Blue, Indigo, Violet.
Students will benefit by viewing various light sources, including Spectrum Tubes through Spectroscopes. This will clearly demonstrate most light is really made up of a series of pure colours.
E3.1 describe and explain various types of light emissions (e.g., chemiluminescence, bioluminescence, incandescence, fluorescence, phosphorescence, triboluminescence; from an electric discharge or light-emitting diode [LED])
Radiometer and hot iron E3.2 identify and label the visible and invisible regions of the electromagnetic spectrum
Radiometer and hot iron E3.2 identify and label the visible and invisible regions of the electromagnetic spectrum The fact that some snakes can see Infra Red Radiation gives them the advantage of being able to better perceive warm blooded prey in the dark.
Radiometer and hot iron E3.2 identify and label the visible and invisible regions of the electromagnetic spectrum
E3.2 identify and label the visible and invisible regions of the electromagnetic spectrum
E3.2 identify and label the visible and invisible regions of the electromagnetic spectrum
E3.1 describe and explain various types of light emissions (e.g., chemiluminescence, bioluminescence, incandescence, fluorescence, phosphorescence, triboluminescence; from an electric discharge or light-emitting diode [LED]) A handout is supplied
Animals with eyes on the side of their heads can only see the object with one eye at a time. They cannot use the triangulation method to determine the object’s location. These animals must use the object’s apparent relative size to determine its location relative to other objects. Pencil Touch Activity - Student activity to demonstrate Improved Depth Perception with two eyes. Hold a pencil in both hands about arm’s length away but with BENT ELBOWS. Close one eye and try to touch the points of the pencils together. Repeat with both eyes open. Discuss which is easier and why.
Explanation: The eyes are focused on a far point; we still see objects that are closer to the eyes. The image from the left eye and the image projected in the right eye are both combined in our brain. This is the reason why we see only a piece of the overlap finger. Whatever image overlaps is seen more clearly. You would never be able to see the same floating piece of finger with one eye closed. We are not able to see depth well with only one eye. If we use only one eye, it is like looking at a picture where image depth can only be determined by the relative size.
Explanation: The eyes are focused on a far point, but we still see objects that are closer to the eyes. The image from the left eye and the image in the right eye are combined in our brain. We see the overlap finger. The overlap is more clear because it is seen by both eyes. You cannot see the floating piece of finger with one eye closed. We are not able to see depth well with only one eye. If we use only one eye, it is like looking at a picture where image depth can only be determined by the relative size.
Explanation: The eyes are focused on a far point, but we still see objects that are closer to the eyes. The image from the left eye and the image in the right eye are combined in our brain. We see the overlap finger. The overlap is more clear because it is seen by both eyes. You cannot see the floating piece of finger with one eye closed. We are not able to see depth well with only one eye. If we use only one eye, it is like looking at a picture where image depth can only be determined by the relative size.
Explanation: The eyes are focussed on a far point, but we still see objects that are closer to the eyes. The image from the left eye and the image in the right eye are combined in our brain. We see the overlap finger. The overlaps is more clear Because it is seen by both eyes. You cannot see the floating piece of finger with one eye closed. We are not able to see depth well with only one eye. If we use only one eye. It is like looking at a picture where image depth can only be determined by their relative size.
See L1 Random Dot Demo (MS Word Document) plus Explanatory Demo in this folder. You can demonstrate this with an overhead projector and two identical transparences of the Random dot diagram below. Hold the transparencies in clear “ Pr esentation Sheet Protectors ” in order to keep them properly aligned. You may have to trim them slightly to fit in the protectors. They should be able to slide smoothly. Start by separating the transparences so that four fusion dots are projected. Then slide them together. As the middle dots start to overlap you will see the “Hidden” circles moving toward the centre. Unfortunately, the overhead projector can only overlap and project one level at a time. It suggests the complexity of the brain which is able to overlap and view all the levels at once. An estimated 5% of the population cannot see 3-D. This may be due to the following: - poor coordination between the left and right eyes. - eyeglasses with a HUGE difference in prescription for the left and the right eyes. - Amblyopia (l a zy eye) disorder characterized by poor or indistinct vision in an eye that is otherwise physically normal. - Squint or Strabismus (eyes are not properly aligned) ~ 4% of the population. People with one eye cannot see 3-D.
Horse brain's have two halves that are not even connected. Trainers say, &quot;be sure to do both sides of the horse” The left brain side does not communicate with his right side brain since they are not connected. http://ezinearticles.com/?Horse-Training---What-Your-Horses-Brain-Needs-From-You-For-Training-Success&id=3488528
Text http://science.howstuffworks.com/question491.htm Podcast http://podcasts.howstuffworks.com/hsw/podcasts/brainstuff/2010-04-28-brainstuff-moon-illusion.mp3