A) The lens moves diagonally.
B) The retina expands and contracts.
C) The lens becomes thicker and thinner.
D) The pupil becomes larger and smaller.
Correct Answer: C
Solution :
When the ciliary muscles contract the lens becomes thick. The focal length decreases and enables us to see near objects. When the ciliary muscles relax, the lens becomes thin and the focal length increases which helps us to see distant objects clearly.
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