The human eye's focal length changes as a result of:

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Iris

Cornea

Pupil

Ciliary muscles

answer is D.

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Detailed Solution

The purpose of ciliary muscles is to adjust the focal length of the eye's element so that it can focus on two different objects at various distances. The curvature of the eye lens changed when the focal length of the eye changed. The ciliary muscles' actions caused it to change.

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