When the ciliary muscles relax, the focal length of the eye lens_

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Remains the same

Increases

Decreases

None of these

answer is B.

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Detailed Solution

When the ciliary muscles relax, the focal length of the eye lens increases.
The ciliary muscles can contract and increase the curvature of the lens so that the lens thickens. The expanded curvature of the lens permits the eye to focus on a nearby item. However, when one needs to look at a faraway object, the muscle tissues loosen up, and the focus of the lens changes to an item further away.

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