Parts of Eye and Their Functions

Q. When the ciliary muscles are relaxed, then the focal length of the eye lens .

1. remains constant
2. decreases
3. increases then decreases
4. increases

Q. A normal eye is not able to see object closer than $25\text{cm}$ because,

1. the focal length of the eye is $25\text{cm}.$
2. the distance of the retina from the eye lens is $25\text{cm}.$
   
3. the eye is not able to decrease the distance between the eye-lens and the retina beyond a limit.
   
4. the eye is not able to decrease the focal length beyond a limit.

Q. 188 For a normal eye the far point is at infinity & near point is 25 cm the cornea of eye provides converging power of 40 diopter & least converging power of eye lens is about 20 dioptres . The range of accommodation (i.e. range of converging power of eye lens ) (in dioptre)is

Q. Match the following for the pupil:
1. Lots of Light I. Dilated
2. Less amount of light II. Contracted

1. 1-I, 2-II
2. 1-II, 2-I

Q. Match the following for the pupil:
1. Lots of Light I. Dilated
2. Less amount of light II. Contracted

1. 1-I, 2-II
2. 1-II, 2-I

Q. The light-sensitive cells found on the retina are known as .

1. Rods and cones
2. Iris and pupil
3. Cochlea and pinna
4. aqueous and humour

Q.

Label the eye parts correctly.i) Aqueous humour ii) vitreous humour iii) cornea iv) iris v) pupil

1. A-i; B-ii, C- iii, D-iv, E- v

2. A-i;B-v, C- iii, D-ii, E- iv

3. A-iii;B-ii, C- i, D-iv, E- v

4. A-i;B-v, C- iii, D-iv, E- ii

Q.

The light-sensitive cells found on the retina are known as:

1. Rods and cones

2. Iris and pupil

3. Cochlea and pinna

4. Vitreous and aqueous humour

Q. A person moves from sunlight into a dark room. How do their eyes respond?

1. The blind spot become larger
2. The pupil become larger
3. The blind spot become smaller
4. The pupil become smaller

Q.

Label the eye parts correctly.i) Aqueous humour ii) vitreous humour iii) cornea iv) iris v) pupil

1. A-i; B-ii, C- iii, D-iv, E- v

2. A-i; B-v, C- iii, D-ii, E- iv

3. A-iii; B-ii, C- i, D-iv, E- v

4. A-i; B-v, C- iii, D-iv, E- ii

Q. When the ciliary muscles are relaxed, then the focal length of the eye lens .

1. remains constant
2. decreases
3. increases then decreases
4. increases

Q. Match the following for the pupil:
1. Lots of Light I. Dilated
2. Less amount of light II. Contracted

1. 1-I, 2-II
2. 1-II, 2-I

Q.

The light-sensitive cells found on the retina are known as:

1. Rods and cones

2. Iris and pupil

3. Cochlea and pinna

4. Vitreous and aqueous humour

Q. The light-sensitive cells found on the retina are known as .

1. Rods and cones
2. Iris and pupil
3. Cochlea and pinna
4. aqueous and humour