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Question
The change in the focal length of an eye lens in human beings is caused by the action of ______.
Options
optic nerves
ciliary muscles
retina
cornea
Solution
The change in the focal length of an eye lens in human beings is caused by the action of ciliary muscles.
Explanation:
The curvature of the eye lens changes as the ciliary muscles relax or contract. The curvature of the eye lens alters the focal length of the eyes. As a result, the activity of ciliary muscles causes a change in the focal length of an eye lens.
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