Q. The focal length of the eye lens increases when eye muscles?

A
are relaxed and lens becomes thinner
B
contract and lens becomes thicker
C
are relaxed and lens becomes thicker
D
contract and lens becomes thinner
Solution:

Ciliary muscles modify the curvature of eye lens.

When eye muscles are relaxed, eye lens becomes thinner thereby are relaxed, eye lens becomes thinner thereby increase in the focal length of eye lens.

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