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Q.

The change in focal length of an eye lens is caused by the action of:

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a

Pupil

b

Retina

c

Ciliary muscles

d

Iris

answer is C.

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Detailed Solution

Ciliary muscles are the ring-type smooth muscles that support the eye lens and help in accommodation for viewing objects at varying distances. 

The relaxation or contraction of ciliary muscles changes the curvature of the eye lens. The change in curvature of the eye lens changes the focal length of the eyes. 

Hence, the change in the focal length of an eye lens is caused by the action of ciliary muscles.

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