Human eye and its working - class-VIII
Description: human eye and its working | |
Number of Questions: 77 | |
Created by: Rachana Sahu | |
Tags: physics the human eye and the colourful world light natural phenomena option c: imaging human eye and colourful world ray optics and optical instruments optics lenses vision and the world of colours |
Sclera is a grey-white membrane, which darkens the eye ball from inside.
Cilliary muscles in the eye:
The nature of image formed on the retina of human eye is:
Which of the following statements about human eye is NOT true?
The cornea gives the colour of the eye.
The impression of an image does not vanish immediately from the retina. It persists there for about $1/6^{th}$ of a second.
There is a pattern observed in the number of sum spots appearing every year called as
The eye lens contains a watery liquid called the :
lens of an eye is a transparent spherical structure which :
The eye lens is a :
The screen behind the eye lens is called the :
The changing of focal length of an eye-lens to focus the image of an object at varying distances is done by the action of the :
The cells in the retina that are able to distinguish between different colours are :
Shape of eye ball is:
The impression of the image formed on the retina of the human eye remains for about:
Aqueous humour is a _________ and vitreous humour is a _________.
Read the statements and mark the correct significance of eyelids:
a. It protects the eye from foreign objects.
b. It shut out the light when not required.
c. It makes the eyes beautiful.
There is a point in our eyes where no image is formed. That point is known as blind spot. Which animal do not have this blind spot?
In dim light:
Mark the correct statement:
a. Blind spot position varies between the left eye and the right eye.
b. For both the eyes blind spot is not exactly in the same place.
c. Octopus do not have the Blind spot.
Transparent front part of eye is:
The part of human eye which is sensitive to red, blue and green light is:
The space between cornea and eye lens is filled with a liquid known as:
When light enters the eyes, most of the refraction occurs at the :
Match the column:
a. optic nerve | i. coloured part of the eye |
---|---|
b. ciliary muscle | ii. refracts light and focuses a real image on the back of eye |
c. lens | iii. it can increase or decrease the thickness of lens |
d.iris | iv. carries information to the brain about light that strikes the retina |
Function of optic nerve in human eye:
When you enter a dim lighted room from sunlight at noon time.What is the change in size of pupil?
Image forming light sensitive screen of the eye is known as __________ and it contains __________.
What is the function of aqueous humour?
Which of the following is true for vitreous humour?
a. It is a clear gel like fluid.
b. It is present between the lens and the cornea.
c. It maintains the shape of the retina.
d. It provides nutrition to the eye.
Match the following
List I | List II | ||
---|---|---|---|
1 | Aqueous humour | a | Forms inverted image on the retina |
2 | Vitreous humour | b | Spherical |
3 | Eyeball | c | Present between lens and retina |
4 | Crystalline lens | d | Present between lens and cornea |
Which of the following statement is correct?
Which part of the eye is a dark muscular diaphragm?
The following properties belong to which part of the eye?
a. It is present between the lens and the cornea.
b. It acts as a protective layer.
c. It maintains the pressure of the eye and provides nutrition.
The curvature of the eye lens can be modified by _____ .
Images formed on retina of human eye are:
Which of the following optical phenomena is used in cinematography or movie projectors?
The human eye part which can be used again and again for forming different images is called
For a normal eye, in case of an adult, the least distance of distinct vision is:
State whether true or false :
A parallel beam of light falling on the eye gets focused on the retina because of refraction at
State whether true or false :
The dark muscular diaphragm in the human eye that controls the pupil is:
In long sightedness image is formed-
Name the part of the eye which gives colour to the eyes.
Our eyes function similar to a:
When the light is very bright, then:
Our eye lens is held in position by :
Image on the retina remains for:
Middle vascular coat that darkens the eye chamber and prevents refraction by absorbing the light rays is:
Eye lens is a :
Eye lens contains a watery liquid called:
Amount of light entering the eye is controlled by:
The eye consists of a screen called ______, on which the light rays are focused.
Two pont white are 1 mm apart on a black paper. They are viewed by eye of pupil diameter 3 mm. Approximately, what is the maximum distance at which these dots can be resolved by the eye ? [Take wavelength of light = 500 nm]
If you read the words of your book, the reflection is
Image formation takes place by
The distance of the eye-lens from the retina is $x$. For a normal eye, the maximum focal length of the eye-lens
The persistence of vision for normal human eye is :
Refraction of light in the eye occurs at ............
A series of fast moving still pictures can create an illusion of movement because.
Which part of human eye controls the amount of light entering the eye?
The presistence of the eye is only for:
Which of the following is Not an advantage of having two eyes?
What is the name of the circular aperture through which light enters the eye ?
The change in focal length of an eye lens in human eye is caused by the action of the:
Which of the following parts of the eye refracts light ?
At the junction of the optic nerve and the retina, there are no sensory cells, so no vision is possible at that spot. This is called the blind spot.
The size of the pupil is controlled by the iris.
Refraction of light in the eye occurs at
The image formed on the retina of the eye is :
Match the following
i. Cornea | a. Back surface of eye where image is formed |
---|---|
ii. Pupil | b. Coloured part of eye |
iii. Retina | c. Membrane that refracts light and protects the eye |
iv. Iris | d. Transparent opening of eye.Light passes through it |
Match the columns
i. amount of light entering into eye controlled by | a. rodes |
---|---|
ii. colour sensing cells | b. cones |
iii.cells helping in vision in dim light | c. iris |
iv. junction of optic nerve and retina | d. blindspot |
The size of an object as perceived by an eye depends primarily on _____ .
What kind of lens is there in our eyes?
The retina is a delicate spot that receives images through the eye lens and makes us see the world. If it gets detatched, it is very difficult to join it back. Therefore, eye surgeons use