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

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Pupil

Retina

Ciliary muscles

Iris

answer is C.

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Detailed Solution

Concept- In order to answer this query, we must offer some insight into the mechanism that causes the human eye's lens to shift in focal length. The curvature of the eye lens varies depending on whether the ciliary muscle is tight or relaxed. The eye's focal length and the eye lens's focal length are related.
Circular in shape, the ciliary muscle . To allow the eye lens to alter shape for focusing, the muscle either relaxes or tightens the zonules. The eye lens can change form during accommodation thanks to the zonules, which are the fibres that keep it suspended in place. It controls whether the eye lens's focal length is increased or decreased.
The curvature of the eye lens is altered by the contraction and relaxation of the ciliary muscles, allowing the eye lens to change shape to match the focal length of the human eye.
Therefore, based on the aforementioned data, we may draw the conclusion that the ciliary muscles function to modify the focal length of an eye lens in the human eye.
Hence, option (3) is the right answer.

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