The focal length of the eye lens increases when eye muscles:
A. Contract and lens becomes thinner.
B. contract and lens becomes thicker.
C. Are relaxed and lens becomes thicker.
D. Are relaxed and lens becomes thinner.
It is the ciliary muscles that change the focal length of the eye lens to see the distant object the focal length of the eye increases. The lens becomes thicker and relaxed. The figure below shows the lens at that time.
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