Power of Accommodation

Q.

The part of the eye which helps in its accommodation is:

1. Retina

2. Iris

3. Ciliary muscles

4. Cornea

Q.

When the eye is looking at a distant object, then the focal length of the eye:

1. does not change

2. becomes zero

3. increases

4. decreases

Q.

What happens to the image distance in the normal human eye when we decrease the distance of an object, say $10\mathrm{m}$ to $1\mathrm{m}$? Justify your answer.

Q.

What is far point of a normal eye?

Q.

The ability of the eye to form an image on the retina by adjusting the focal length of the eye lens based on the position of the object is called _____.

1. power of lens

2. power of accommodation

3. power of retina

4. presbyopia

Q.

As the position of an object changes, the focal length of eye lens also gets adjusted by changing the curvature of the lens with the help of

1. ciliary muscles

2. iris

3. pupil

4. retina

Q.

Ram wants to observe the change in size of the pupil. He flashes light on Rajat's eye with a torch. What will he observe and why? Why should Ram not use laser light for this purpose? [3 MARKS]

Q. What kind of lens is used to rectify myopia?

1. Biconvex lens
2. Convex lens
3. Concave lens
4. Cylindrical lens

Q.

Resolving Power means how clearly we can differentiate between colours.

1. True

2. False

Q.

When one is seeing things that are nearby, the ciliary muscles contract to decrease the focal length of the eye lens.

1. True

2. False

Q.

If a person is reading a novel, then his ciliary muscles:

1. contract

2. expand

3. remains in the previous position

4. can't say

Q. The ability of an eye lens to adjust its focal length to form sharp images on the retina is known as its power of accommodation.

1. True
2. False

Q.

If you are looking at the moon, then what happens to your ciliary muscles?

1. contract

2. expand

3. remains in the previous position

4. can't say

Q. The image formed by the eye lens on the retina is.

1. Real, upright and enlarged
2. Real, upright and diminished
3. Real, inverted and diminished
4. Virtual, inverted and diminished

Q. In myopic eye , when we stretch our eye muscles , why we can see far objects more clearer without spectacles?