Pupil

Q.

The human eye forms the image of an object at its_____.

Q. Why does it take some time to see objects in a dim room when you enter the room from bright sunshine outside ?

Q.

When we enter in a dark room from a bright area, our vision is impaired for few seconds. Why does this happen?

1. Rods and cones are ineffective in dark

2. Our eye shifts the retina more closer to our eye lens to form the image correctly

3. We cannot see in dark room

4. Pupil takes time to adjust

Q.

Why is the colour of pupil black for every person's eye?

1. Pupil has a pigment that makes it looks black.

2. pupil reflects all light that falls on it so it looks black

3. none of these

4. pupil absorbs all the light that falls on it and allows it to go in the eye so it looks black

Q.

Amount of light entering in human eye is controlled by:

1. Retina

2. Cornea

3. Pupil

4. Eye lens

Q. Arrange the parts of the human eye in the correct sequence of arrangement starting from the outermost part.

1. Cornea
2. Pupil
3. Lens
4. Retina
5. Optic nerve

Q.

When we enter into a dark room our vision is impaired for few seconds. Why does this happen?

1. We cannot see in the dark room.

2. Our eye shifts the retina closer to our eye lens to form the image correctly.

3. Pupil takes time to adjust.

4. Rods and cones are ineffective in dark.

Q. Why we are not able to see the objects when we enter from bright light to a room with dim light?

Q.

Mention the characteristics of the image that falls on the retina of the eye.

Q.

If we enter any dark room, what happens to the size of our pupil?

1. expands
2. contracts
3. can't say
4. remains same

Q. In a human eye, helps the to contract and expand and thereby controls the amount of light entering our eye.

1. eyelens
2. ciliary muscle
3. iris
4. pupil

Q.

When we enter a dark room, what happens to the size of the pupil?

1. Closes

2. Expands

3. Contracts

4. Decreases

Q. What job does the pupil of the eye do ?

Q.

What are the meaning of expand and relaxation in eye ?

Q. Which of the following changes occur when you walk out of bright sunshine into a poorly lit room ?
(a) the pupil becomes larger (b) the lens becomes thicker
(c) the ciliary muscle relaxes (d) the pupil becomes smaller

Q. A person walking in a dark corridor enters into a brightly lit room :
(a) State the effect on the pupil of the eye.
(b) How does this affect the amount of light entering the eye ?

Q.

How does the eye adjust to take account of an increase in brightness ?

Q. Explain power of accomodation
also explain what happens when ciliary muscles contract and relax (does the focal length increase or decrease) (what happens to the reading power if it increases or decreases)

Q.

When we enter a dark room with very little light, our vision is impaired for few seconds. Why?

1. We cannot see in the dark room

2. The intensity is low in dark room so pupil expands to allow more light into the eye, which takes time

3. Our eye shifts the retina closer to our eye lens to form the image correctly

4. Both (a) and (b)

Q. What happens to the eye when you enter a darkened cinema hall from bright sunshine ? Give reason for your answer.

Q.

What function does iris do while we are sleeping?

Q.

When we enter in a dark room from a bright area, our vision is impaired for few seconds. Why does this happen?

1. We cannot see in dark room

2. Our eye shifts the retina more closer to our eye lens to form the image correctly

3. Pupil takes time to adjust

4. Rods and cones are ineffective in dark

Q.

Amount of light entering in human eye is controlled by:

1. Retina

2. Cornea

3. Pupil

4. Eye lens

Q. what is the focal length of our eye when we are sleeping or when we are thinking with closed eyes ?

Q. The vertical field of view for a single-eyed human (in degrees) is:

1. 90
2. 120
3. 150
4. 180

Q. What job does the pupil of the eye do ?

Q.

Why is the colour of pupil black for every person's eye?

1. Pupil reflects all the light that falls on it so it looks black.

2. Pupil has a pigment that makes it looks black.

3. Pupil absorbs all the light that falls on it and allows it to go in the eye so it looks black.

4. None of these.

Q. What happens to the size of the pupil when we enter a dark room?

1. It remains the same.
2. It expands.
3. It contracts.
4. It reduces to half.

Q.

If you enter a dark room, what happens to the size of the pupil?

1. Contracts

2. None of these

3. No change

4. Expands

Q.

What happens to the pupil, if you see the sunlight directly?

1. contracts

2. does not change

3. none of these

4. expands