The focal length of the eye lens increases when eye muscles

Question:

The focal length of the eye lens increases when eye muscles

(a) are relaxed and lens becomes thinner

(b) contracts and lens becomes thicker

(c) are relaxed and lens becomes thicker

(d) contract and lens becomes thinner

Solution:

(a).
Explanation : Focal length of thin lens is greater than the focal length of thick glass.

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