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The focal length of the eye lens increases when the eye muscles ________.

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are relaxed and the lens becomes thinner

contract and lens become thicker

are relaxed, and the lens becomes thicker

contract and lens become thinner

answer is A.

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Detailed Solution

The focal length of the eye lens increases when eye muscles are relaxed, and the lens becomes thinner.
Ciliary muscles are responsible for altering the curvature of the eye lens. When eye muscles are relaxed, the eye lens becomes thinner and thereby gets relaxed. As the eye lens becomes thinner, there is an increase in the focal length of the eye lens.

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