Question

what helps the eye lens to change its focal length?

A)iris
B)ciliary muscles
C)pupil
D)cornea
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Answer 1

Answer:

what helps the eye lens to change its focal length?

Ans-B)ciliary muscels

Answer 2

Answer:

The correct answer is B) $\LARGE\underline\bold\blue{Ciliary Muscles}$

[The change in curvature of the eye lens changes the focal length of the eyes. Hence, the change in focal length of an eye lens is caused by the action of ciliary muscles.It is made possible because the focal length of the human lens can change i.e., increase or decrease, depending on the distance of objects. It is the ciliary muscles that can modify the curvature of the lens to change its focal length.

To see the nearby objects clearly, the focal length of the lens should be shorter. For this, the ciliary muscles contract to increase the curvature and thereby decrease the focal length of the lens. Hence, the lens becomes thick. This enables you to see the nearby objects clearly.

The ability of the eye lens to adjust its focal length accordingly as the object distances is called power of accommodation.]

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