The curvature of the eye lens can be modified by _____.

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Iris

Cornea

Pupil

Ciliary muscles

answer is A.

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Detailed Solution

The substance that makes up the eye lens is fibrous and jelly-like.
The ciliary muscles can alter their curvature to some amount, changing their focal length.
When the muscles are relaxed, the lens becomes thinner and its curvature reduces, increasing the focal length.
Similar to this, when the ciliary muscles tighten, the eye's lenses become larger and more curved, which reduces the focal length of the eye.

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