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

remains constant

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increases

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decreases

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may increase or decrease

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Solution

The correct option is B
increases

When ciliary muscles are relaxed, then the focal length of eye lens increases. When the muscles are relaxed, the lens becomes thin. Thus, it's focal length increases. This enables us to see distant objects clearly.

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The focal length of the eye lens increases when eye muscles

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