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To focus the image of a nearby object on the retina of an eye:
(a) the distance between eye-lens and retina is increased.
(b) the distance between eye-lens and retina is decreased.
(c) the thickness of eye-lens is decreased. (d) the thickness of eye-lens is increased.
(d) the thickness of eye-lens is increased.
Explanation
The lens of an eye is made up of elastic tissues that control the formation of an image on the retina. It is connected with the ciliary muscles that accommodate the eye lens, which means, it changes the shape of the lens to focus on near or distant objects.
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 result in a decrease in the thickness of the lens (becomes thin). While 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 result in an increase in the thickness of the lens (becomes thick).
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