The document provides information about the human eye and vision. It discusses the basic anatomy of the eye, including the cornea, iris, lens, retina, and optic nerve. It describes how the lens focuses light onto the retina to form an image and allows for accommodation. Common vision defects like myopia, hyperopia, and presbyopia are also summarized along with how they are corrected using lenses. The document additionally covers topics of dispersion, scattering of light, and the Raman effect.
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
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.
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 .
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
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.
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 .
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.
POWERPOINT NOT MINE. CREDITS TO THE RIGHTFUL OWNER. I JUST SHARED IT HERE SO I CAN PUT A LINK TO MY BLOG. I'M TOO LAZY TO TYPE ALL THESE ONE BY ONE LOL
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
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.
POWERPOINT NOT MINE. CREDITS TO THE RIGHTFUL OWNER. I JUST SHARED IT HERE SO I CAN PUT A LINK TO MY BLOG. I'M TOO LAZY TO TYPE ALL THESE ONE BY ONE LOL
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
These lectures has prepared for postgraduate student (Ophthalmology) according to the curriculum of Bangladesh College of Physician and Surgeons (BCPS) and Bangabondhu Sheikh Mujib Medical University (BSMMU) Bangladesh
. Introduction Biomicroscope derives its name from the fact that it enables the practitioner to observe the living tissue of eye under magnification. It not only provides magnified view of every part of eye but also allows quantitative measurements and photography of every part for documentation.
3. • The lamp facilitates an examination which looks at anterior segment, or frontal structures, of the human eye, which includes the –Eyelid –Cornea –Sclera –Conjunctiva –Iris –Aqueous –Natural crystalline lens and –Anterior vitreous.
4. Important historical landmarks De Wecker 1863 devised a portable ophthalmomicroscope . Albert and Greenough 1891,developed a binocular microscope which provided stereoscopic view. Gullstrand ,1911 introduced the illumination system which had for the first time a slit diapharm in it Therefore Gullstrand is credited with the invention of slit lamp.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
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.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
Embracing GenAI - A Strategic ImperativePeter 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.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
1. AP POLYCET 2018 STUDY MATERIAL FOR
PHYSICS(EM)
SBTET, AP, AMARAVATI
2. CHAPTER 7
Human Eye and Colourful World
Summary:
• The maximum angle, at which humans can see the whole object is called
angle of vision.
• The angle of vision for a healthy human being is about 600
.
• It varies from person to person and with age.
• Humans can see an object comfortably and distinctly when held at a
distance of 25 cm.
• This distance of 25 cm is called least distance of distinct vision.
3. • The eye ball is nearly spherical in shape.
• The front portion is covered by a transparent
protective membrane called the ‘cornea’.
• Behind the cornea, filled with a liquid called aqueous humour and
behind this a crystalline lens.
• It is responsible for the image formation.
• Iris, is the coloured part, is the muscular diaphragm, with a small
hole, called pupil.
• Iris controls the amount of light entering the eye through ‘pupil’.
• Iris makes pupil to act as a “variable aperture” for light to enter into
the eye.
• The light that enters the eye forms an image on the
retina.
• The distance between the lens and retina is about 2.5
cm
• The image distance is fixed and is 2.5 cm for any
position of object.
• the focal length of a lens depends on its material and
radii of curvature of lens.
• The eye lens can change its shape with the help of ciliary muscle
attached to it which change its focal length by changing the radii of
curvature.
• The process of adjusting focal length of lens is called
“accommodation” of lens.
• The eye-lens forms a real and inverted image of an object on the
retina.
4. • Retina contains 125 million receptors called “rods and cones”
which receive the light signals.
✓ Rods identify the Intensity of light,
✓ Cones identify the colour.
✓ These are transmitted to the brain through the optic
nerve fibres.
• The vision becomes blurred due to “ accommodation defects” of
the eye.
Defects of Eye:
• There are mainly three defects of eye.
1. Myopia:
✓ Cannot see objects at long distances.
✓ Also called- near or short sightedness.
✓ For these people, focal length is < 2.5 cm.
✓ Image forms before the retina.
✓ A concave lens is used to correct myopia.
Hypermetropia:
✓ Cannot see objects at short distances.
✓ Also called far or long sightedness.
✓ For these people, focal length is > 2.27 cm.
✓ Image forms beyond the retina.
✓ A biconvex lens is used to correct hypermetropia.
Presbyopia:
✓ The ability of eye decreases with age.
✓ Near point disappears.
✓ Difficult to see the nearby objects clearly and
distinctly.
✓ Due to weakening of ciliary muscles and flexibility
of eye lens.
✓ Is wide spread in aged people.
✓ A person can suffer from both Myopia and
hypermetropia with aging.
✓ To correct this defect of vision, bi - focal lenses
which contain both concave and convex lenses.
✓ Upper portion is concave part, and lower convex
part.
Power of Lens:
✓ It is the degree of convergence or divergence of light
rays by a lens.
5. ✓ IT is the reciprocal of focal length in metre.
✓ P = 1/f
✓ Unit is dioptre.
✓ Denoted by D
Multiple choice questions:
1. The least distance of distinct vision is about ________
a) 25 cm b) 50 cm c) 30 cm d) 15 cm
2. The distance between eye lens and retina is about ______
a)10 cm b) 2.5 cm c)2 cm d) 5 cm
3. The maximum focal length of eye lens is about ________
a) 2.5 cm b) 2.2 cm c)3 cm d) 1.5 cm
4. The power of lens is 1D then focal length is________
a) 100 cm b) 50 cm c) 25 cm d) 75 cm
5.Myopia can be corrected by which lens________
a) concave lens b) convex lens c) concavo-convex
d) Plano convex
6. The size of the object is perceived by an eye depends on _____
a) size of the object b) distance of the object from the eye
c) aperture of the pupil d) size of image on retina
7. A doctor advised to use 4D lens. The focal length of the lens is
a) 25 cm b) 400 cm c) 4 cm d) 40 cm
8. Which part of the human eye helps the lens to change its focal length?
a) Retina b) Pupil c) ciliary muscle d) cornea
9. For every position of an object in front of the human eye, the image
distance is fixed at
a) 1 cm b) 1.5 cm c) 2.5 cm d) 0.25 cm
10. To correct one’s hypermetropia defect, the type of lens used is _____
a) biconvex b) biconcave c) concavo- convex
d) planoconcave
KEY
1. a 2. b 3. a 4. a 5. a 6. b
7. a 8. c 9. c 10. a
6. Dispersion and Scattering of Light:
• Refractive index of prism, n = (Sin (A + D)/2)/Sin (A/2)
Where n = refractive index of the prism,
A = Angle of prism, D = Angle of deviation
• The splitting of white light into colours (VIBGYOR) is called
Dispersion.
• The colours of Rainbow are due to dispersion of the sunlight by
millions of tiny water droplets.
• In refraction the frequency of light wave in one medium is same in
both the media, i.e, frequency remains unaltered (will not change),
but wavelength changes.
• v = n λ, where v = speed of light, n = frequency, λ = wave length.
• The process of re-emission of absorbed light in all directions with
different intensities by atoms or molecules, is called “scattering of
light”.
• Sir C.V. Raman invented the Scattering of light.
• Raman experimentally found the frequency of scattered light is
greater than the frequency of incident light. This is called
“ Raman Effect”.
• Raman effect is used to determine the shapes of molecules.
Multiple choice questions:
1. With an increase in angle of incidence of light ray on a prism, the
angle of deviation__
a) remains constant b) first increases and then decreases
7. c)first decreases and then increases d) first increases and then
remains constant.
2. The scientific work of C.V. Raman is on
a) dispersion of light b) total internal reflection
c) defection of vision d) scattering of light
3. Scattering of light involves the process of
a) bending of light at the interface of two media
b) splitting of light into different colours
c) convergence of light rays at the focus
d) re -emission of absorbed light
4. Blue of sky is explained by
a) scattering of light b) total internal reflection
c) refraction of light d) dispersion of light
5. The sun appears red colour during sunset and sunrise, due to
a) scattering of red light is very small b) scattering of red light is high
c) scattering of other colours is high d) none of these
KEY
1. c 2. d 3. d 4. a 5. a