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What changes the shape of lens in the eye?
The ciliary muscles change the shape of the lens in the eye.
Explanation
Ciliary muscles are circular muscle which accommodates the eye lens, means it changes the thickness of the eye-lens while focussing by changing its shape and thereby enable us to see objects that are near or far away.
Therefore, when the light is coming from a distant object the light rays refract slightly as the lens got stretched/tighten by ciliary muscles which results in a decrease in the thickness of the lens (becomes thin).
Whereas, when the light is coming from a nearby object the light rays refract (bends) more strongly as the lens got slacken/loosen by ciliary muscles which results in an increase in the thickness of the lens (becomes thick).
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