The human eye functions similar to a camera, with light entering through the pupil and being focused by the cornea and lens onto the retina. The retina contains rod and cone cells that allow for vision and color perception. As light enters the eye, the iris adjusts the size of the pupil to regulate the amount of light. Various eye conditions exist such as nearsightedness, farsightedness, and cataracts that affect vision by changing the eye's ability to focus light properly.
Physics ( human eye and the colourful world).Nikhil Dahiya
ppt on human eye and its structure. shows different parts of the eye . helps the student to learn about the eye more breifly.it is a science ppt which will be helpfull . teachers can also take it in the us for letting the students understand better .
Electricity Class 10 Physics Chapter Complete with FormulaeShreyaans Nahata
Hey guys!!
I give you all 'Electricity Class 10' from NCERT SCIENCE Textbook. It Contains every thing you need to study including formulas and definitions.
Please do not forget to like it if you like it!!!
The human eye is one of the most valuable and sensitive sense organs in the human body. It enables us to see the wonderful world and colours around us.
Structure of eye:
The human eye has the following main parts:
Cornea: It is the transparent spherical membrane covering the front of the eye. Light enters the eye through this membrane.
Crystalline lens: The eyes lens is a convex lens made of a transparent, soft and flexible material like a jelly made of proteins.
Iris: It is a dark muscular diaphragm between the cornea and the lens. It controls the size of the pupil. It is the colour of the iris that we call as the colour of the eye.
Pupil: It is a small hole between the iris through which light enters the eye. In dim light, it opens up completely due to expansion of iris muscles, but in bright light it becomes very small due to contraction of iris muscles.
14 chemical effects of electric currentCHEKIT SHARMA
this is the best chapter in science as it is my favioratie as i love chemistry and even i think that the people who would view this will like so i request to plese like share and comment so ok today only this much is enough so i'll leave bye
Chapter 3.metals and non metals priya jhaPriya Jha
An element is the simplest form of matter that cannot be split into simpler substances or built from simpler substances by any ordinary chemical or physical method. There are 118 elements known to us, out of which 92 are naturally occurring, while the rest have been prepared artificially. Elements are further classified into metals, non-metals, and metalloids based on their properties, which are correlated with their placement in the periodic table.Metals
With the exception of hydrogen, all elements that form positive ions by losing electrons during chemical reactions are called metals. Thus metals are electropositive elements with relatively low ionization energies. They are characterized by bright luster, hardness, ability to resonate sound and are excellent conductors of heat and electricity. Metals are solids under normal conditions except for Mercury.Nonmetals
Elements that tend to gain electrons to form anions during chemical reactions are called non-metals. These are electronegative elements with high ionization energies. They are non-lustrous, brittle and poor conductors of heat and electricity (except graphite). Non-metals can be gases, liquids or solids.Metalloids
Metalloids have properties intermediate between the metals and nonmetals. Metalloids are useful in the semiconductor industry. Metalloids are all solid at room temperature. They can form alloys with other metals. Some metalloids, such as silicon and germanium, can act as electrical conductors under the right conditions, thus they are called semiconductors. Silicon for example appears lustrous, but is not malleable nor ductile (it is brittle - a characteristic of some nonmetals). It is a much poorer conductor of heat and electricity than the metals. The physical properties of metalloids tend to be metallic, but their chemical properties tend to be non-metallic. The oxidation number of an element in this group can range from +5 to -2, depending on the group in which it is located.
This Presentation is especially for the grade 10 as it is informaive and can be used for the CBSE syllabus of india ( of course ). hope this helps you alot and if any problems please let me know from the comments section below.................peace out......... and message me at bavitharavi@hotmail.com. this is also the chpter 9 of the cbse gr 10 science book biology.
Magnetic Effects of Electric Current 10th PhysicsSHIVAM RANJAN
The magnetic effect of electric current is known as electromagnetic effect. It is observed that when a compass is brought near a current carrying conductor the needle of compass gets deflected because of flow of electricity. This shows that electric current produces a magnetic effect.
In this ppt, i tried to give my best so that any one who wants to find the same gains some knowledge or material from it.
For more updates contact me at 7807907761/myrules663@gmail.com
Human Eye and Colorful World. Chapter 11 grade 10thMurari Parashar
Chapter 11 Human Eye and Colorful World. Human eye is the optical instrument used which enables us to see.
We will study various natural optical phenomenon like Rainbow formation, twinkling of star, blue and red color of sky etc.
Physics ( human eye and the colourful world).Nikhil Dahiya
ppt on human eye and its structure. shows different parts of the eye . helps the student to learn about the eye more breifly.it is a science ppt which will be helpfull . teachers can also take it in the us for letting the students understand better .
Electricity Class 10 Physics Chapter Complete with FormulaeShreyaans Nahata
Hey guys!!
I give you all 'Electricity Class 10' from NCERT SCIENCE Textbook. It Contains every thing you need to study including formulas and definitions.
Please do not forget to like it if you like it!!!
The human eye is one of the most valuable and sensitive sense organs in the human body. It enables us to see the wonderful world and colours around us.
Structure of eye:
The human eye has the following main parts:
Cornea: It is the transparent spherical membrane covering the front of the eye. Light enters the eye through this membrane.
Crystalline lens: The eyes lens is a convex lens made of a transparent, soft and flexible material like a jelly made of proteins.
Iris: It is a dark muscular diaphragm between the cornea and the lens. It controls the size of the pupil. It is the colour of the iris that we call as the colour of the eye.
Pupil: It is a small hole between the iris through which light enters the eye. In dim light, it opens up completely due to expansion of iris muscles, but in bright light it becomes very small due to contraction of iris muscles.
14 chemical effects of electric currentCHEKIT SHARMA
this is the best chapter in science as it is my favioratie as i love chemistry and even i think that the people who would view this will like so i request to plese like share and comment so ok today only this much is enough so i'll leave bye
Chapter 3.metals and non metals priya jhaPriya Jha
An element is the simplest form of matter that cannot be split into simpler substances or built from simpler substances by any ordinary chemical or physical method. There are 118 elements known to us, out of which 92 are naturally occurring, while the rest have been prepared artificially. Elements are further classified into metals, non-metals, and metalloids based on their properties, which are correlated with their placement in the periodic table.Metals
With the exception of hydrogen, all elements that form positive ions by losing electrons during chemical reactions are called metals. Thus metals are electropositive elements with relatively low ionization energies. They are characterized by bright luster, hardness, ability to resonate sound and are excellent conductors of heat and electricity. Metals are solids under normal conditions except for Mercury.Nonmetals
Elements that tend to gain electrons to form anions during chemical reactions are called non-metals. These are electronegative elements with high ionization energies. They are non-lustrous, brittle and poor conductors of heat and electricity (except graphite). Non-metals can be gases, liquids or solids.Metalloids
Metalloids have properties intermediate between the metals and nonmetals. Metalloids are useful in the semiconductor industry. Metalloids are all solid at room temperature. They can form alloys with other metals. Some metalloids, such as silicon and germanium, can act as electrical conductors under the right conditions, thus they are called semiconductors. Silicon for example appears lustrous, but is not malleable nor ductile (it is brittle - a characteristic of some nonmetals). It is a much poorer conductor of heat and electricity than the metals. The physical properties of metalloids tend to be metallic, but their chemical properties tend to be non-metallic. The oxidation number of an element in this group can range from +5 to -2, depending on the group in which it is located.
This Presentation is especially for the grade 10 as it is informaive and can be used for the CBSE syllabus of india ( of course ). hope this helps you alot and if any problems please let me know from the comments section below.................peace out......... and message me at bavitharavi@hotmail.com. this is also the chpter 9 of the cbse gr 10 science book biology.
Magnetic Effects of Electric Current 10th PhysicsSHIVAM RANJAN
The magnetic effect of electric current is known as electromagnetic effect. It is observed that when a compass is brought near a current carrying conductor the needle of compass gets deflected because of flow of electricity. This shows that electric current produces a magnetic effect.
In this ppt, i tried to give my best so that any one who wants to find the same gains some knowledge or material from it.
For more updates contact me at 7807907761/myrules663@gmail.com
Human Eye and Colorful World. Chapter 11 grade 10thMurari Parashar
Chapter 11 Human Eye and Colorful World. Human eye is the optical instrument used which enables us to see.
We will study various natural optical phenomenon like Rainbow formation, twinkling of star, blue and red color of sky etc.
the current topic contain information about anatomy of human eye and defect in vision and their corrections the p.p.t. also explain dispersion and scattering of light this p.p.t.is very useful f for secondary classes students
In this power point presentation, we discuss about the light, the laws of reflection, how we are able to see things, about human eye and how human vision works. We also talk about application of reflection of light by discussing about periscope and kaleidoscope.
In the realm of biology, the human eye is a marvel of nature's engineering, allowing us to perceive the world around us with clarity and detail. It is not only a sensory organ but also a gateway to understanding the physics of light and color. Class 10 Science introduces students to the intricacies of the human eye and its interaction with light, delving into topics such as refraction, dispersion, and the perception of color. In this detailed study guide, we will explore these concepts comprehensively to aid students in understanding this fascinating aspect of biology and physics.
For more information, visit-www.vavaclasses.com
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
Acetabularia Information For Class 9 .docxvaibhavrinwa19
Acetabularia acetabulum is a single-celled green alga that in its vegetative state is morphologically differentiated into a basal rhizoid and an axially elongated stalk, which bears whorls of branching hairs. The single diploid nucleus resides in the rhizoid.
Safalta Digital marketing institute in Noida, provide complete applications that encompass a huge range of virtual advertising and marketing additives, which includes search engine optimization, virtual communication advertising, pay-per-click on marketing, content material advertising, internet analytics, and greater. These university courses are designed for students who possess a comprehensive understanding of virtual marketing strategies and attributes.Safalta Digital Marketing Institute in Noida is a first choice for young individuals or students who are looking to start their careers in the field of digital advertising. The institute gives specialized courses designed and certification.
for beginners, providing thorough training in areas such as SEO, digital communication marketing, and PPC training in Noida. After finishing the program, students receive the certifications recognised by top different universitie, setting a strong foundation for a successful career in digital marketing.
How to Build a Module in Odoo 17 Using the Scaffold MethodCeline George
Odoo provides an option for creating a module by using a single line command. By using this command the user can make a whole structure of a module. It is very easy for a beginner to make a module. There is no need to make each file manually. This slide will show how to create a module using the scaffold method.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
This slide is special for master students (MIBS & MIFB) in UUM. Also useful for readers who are interested in the topic of contemporary Islamic banking.
MATATAG CURRICULUM: ASSESSING THE READINESS OF ELEM. PUBLIC SCHOOL TEACHERS I...NelTorrente
In this research, it concludes that while the readiness of teachers in Caloocan City to implement the MATATAG Curriculum is generally positive, targeted efforts in professional development, resource distribution, support networks, and comprehensive preparation can address the existing gaps and ensure successful curriculum implementation.
it describes the bony anatomy including the femoral head , acetabulum, labrum . also discusses the capsule , ligaments . muscle that act on the hip joint and the range of motion are outlined. factors affecting hip joint stability and weight transmission through the joint are summarized.
2. The human eye is an
organ that reacts to light
and has several purposes.
As a sense organ, the
mammalianeye allows visi
on. Rodand cone cells in
the retina allow conscious
light perception and
vision including color differentiation and the
perception of depth. The human eye can
distinguish about 10 million colors.
3. WORKING OF HUMAN EYE
The individual components of the eye work in a manner
similar to a camera. Each part plays a vital role in providing
clear vision. So think of the eye as a camera with the cornea,
behaving much like a lens cover. As the eye 's main focusing
element, the cornea takes widely diverging rays of light and
bends them through the pupil, the dark, round opening in
the center of the colored iris. The iris and pupil act like the
aperture of a camera.
Next in line is the lens which acts like the lens in a camera,
helping to focus light to the back of the eye. Note that the
lens is the part which becomes cloudy and is removed during
cataract surgery to be replaced by an artificial implant
nowadays.
The Camera The Human Eye
4.
5. The iris control the amount of light entering the
eyes. The iris automatically adjust the size of the
pupil according to the intensity of light received by
the eye. If the amount of light received by the eye
is large (as during the day time ),then the iris
contracts the pupil (makes the pupil small) and
reduces the amount of light entering the eye. On
the other hand , if the amount of light received by
the eye is small(as the room is dark)the iris
expands the pupil (make the pupil large ) so that
more light may enter the eyes.
The adjustment of the size of pupil takes some
time .
6.
7.
8. The retina of our eye has a large number of light –
sensitive cells. There are two kinds of light-sensitive
cells on the retina: rods and cones .
9. Rod cells, or rods,
are photoreceptor cells in
the retina of the eye that can
function in less
intense light than the other
type of visual
photoreceptor, cone cells.
Cone cells, or cones, are one
of the two types
of photoreceptor cells that
are in the retina of
the eye which are
responsible for color
vision as well as eye color
sensitivity; they function best
in relatively bright light, as
opposed to rod cells that
work better in dim light.
10. Accommodation (eye)
Accommodation (Acc) is the process by which the
vertebrate eye changes optical power to maintain a
clear image or focus on an object as its distance
varies.
Accommodation acts like a reflex, but can also be
consciously controlled. Mammals, birds and reptiles
vary the optical power by changing the form of the
elastic lens using the ciliary body (in humans up to
15 dioptres). Fish and amphibians vary the power by
changing the distance between a rigid lens and the
retina with muscles.[1]
11.
12.
13. Myopia
Myopia commonly known as near-sightedness
(American English) and short-sightedness (British
English), is a condition of the eye where the light
that comes in does not directly focus on the retina
but in front of it, causing the image that one sees
when looking at a distant object to be out of
focus, but in focus when looking at a close object.
14. This figure shows an defect
called myopia. In this case, the
parallel rays of light coming
from the distant object are
converged to form an image in
front of the retina due to
which the eye cannot see the
distant object clearly. Myopia
is corrected by using
spectacles containing
concave lenses. When concave
lens is placed in front of the
myopic eye as shown in figure
then the parallel rays of light
coming from the distant
object at the far point of
myopic eye. Since the rays of
light now appear to be
coming from the eye’s far
15. Hypermetropia (Hyperopia) - Long Sighted
The defects of eye
called hypermetropia is
caused :
i. Due to low
converging power of
eye-lens,
ii. Due to eye –ball
being too small.
16. Hypermetropia means long sight and
is where the image of nearby object
is formed behind the retina. This
could be because the eye is too
short, or the cornea or crystalline lens
does not refract the light enough.
A hypermetropic person may have
blurred vision when looking g at
objects close to them, and clearer
vision when looking at objects in the
distance. By placing a convex (plus
powered) lens in front of a
hypermetric eye, the image is moved
forward and focuses correctly on the
retina.
17. Presbyopia
Presbyopia is a condition associated with
aging in which the eye exhibits a
progressively diminished ability to focus on
near objects. Presbyopia’s exact
mechanisms are not fully understood;
research evidence most strongly supports a
loss of elasticity of the crystalline lens,
although changes in the lens’ curvature
from continual growth and loss of power of
the ciliary muscles (the muscles that bend
and straighten the lens) have also been
postulated as its cause.
18. This defect is corrected in the same way as
hypermetropa is by using spectacles having
convex lenses.
19. Cataract
A cataract is a clouding of the lens inside
the eye which leads to a decrease in vision. It is
the most common cause of blindness and is
conventionally treated with surgery. Visual loss
occurs because opacification of
the lens obstructs light from passing and being
focused on the retina at the back of the eye.
It is most commonly due to aging, but has many
other causes.
20. Over time, yellow-brown pigment is deposited in
the lens, and this, together with disruption of the
lens fibers, reduces the transmission of light and
leads to visual problems.
Those with cataracts often experience difficulty in
appreciating colors and changes in contrast,
driving, reading, recognizing faces, and coping
with glare from bright lights.
21.
22.
23. Scattering of light
Scattering of light Means to
throw light in various random
directions
31. A rainbow is an optical and
meteorological
phenomenon that is
caused by both reflection
and refraction of light in
water droplets resulting in
a spectrum of light
appearing in the sky. It
takes the form of a
multicolored arc .
Rainbows caused by
sunlight always appearin
the section of sky directly
opposite the sun.
32. The Steps Involved in the
formation of a rainbow
1. Light from sun strikes raindrop.
2. Some of the light is reflected.
3. The rest of the light is
refracted.
4. White light splits into
component colors.
5. Light is refracted again as it
leaves raindrop.
6. Colors are further dispersed.
38. Why is the Sky Blue?
1. The blue color of the sky is due
to Rayleigh scattering. As light
moves through the atmosphere,
most of the longer wavelengths
pass straight through. Little of
the red, orange and yellow light
is affected by the air.
2. However, much of the shorter
wavelength light is absorbed by
the gas molecules. The absorbed
blue light is then radiated in
different directions. It gets
scattered all around the sky.
Whichever direction you look,
some of this scattered blue light
reaches you. Since you see the
blue light from everywhere
overhead, the sky looks blue.
3.As you look closer to the horizon,
the sky appears much paler in color.
To reach you, the scattered blue light
must pass through more air. Some of it
gets scattered away again in other
directions. Less blue light reaches your
eyes. The color of the sky near the
horizon appears paler or white.
39.
40.
41. Cloud particles are large enough
to scatter any color of light that
falls on them. The repeated
scattering of light, called multiple
scattering, causes whitish light
because enough light of all colors
is scattered to your eye, and those
colors combine to make white
light.
•When light beams
interact with particles
suspended in air,
some of the energy is
scattered, which
means the light beam
changes direction,
and usually color as
well. The amount of
light scattered is a
function of the size
of the particle
relative to the
wavelength of light
falling on it.
42.
43. At sunrise or
sunset, however,
when the Sun is
low on the
horizon, the light
rays must pass
through more of
the atmosphere –
and therefore
bounce off more
molecules – than
at other times of
day. This means
that more blue
light gets
scattered away
before the light
reaches your
eyes.
Other colours – such as red, orange
and yellow – can therefore continue
to pass through the atmosphere
unaffected, creating beautiful
colours at the start and end of the
day.