When the ciliary muscles are relaxed, then the focal length of the eye lens ___.

remains constant

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increases

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decreases

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first increases then decreases

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Solution

The correct option is B
increases

When ciliary muscles are relaxed, then the lens becomes thin i.e. the focal length of eye lens increases. The lens has the capacity to increase its focal length in order to view distant objects.

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Relaxation of the ciliary muscles causes the focal length of eye lens to:

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