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An object is moved closer to an eye. What changes must take place in the eye in order to keep the image in sharp focus?
When an object is moved closer to an eye, then the changes that must take place in the eye in order to keep the image in sharp focus is that the ciliary muscles should contract so that the suspensory ligaments attached to them get loosened, and stop pulling the eye lens. As a result, the eye lens becomes thick, increasing its converging power. The greater converging power enables the eye to focus the diverging rays coming from the nearby object onto the retina. Thus, a clear image formed on the retina.
Explanation
When the eye is focusing on a nearby object, the eye lens bulges and becomes thicker because, while focusing on a nearby object, the ciliary muscles of the eyes contract, loosening the suspensory ligaments attached to the eye. Since these ligaments become loose, they stop pulling the eye lens, due to which the eye lens bulges under its own elasticity and becomes thick (or more convex) so as to increase its converging power. Since the converging power gets increased, the thick eye lens can converge the diverging light rays coming from the nearby object to form an image on the retina.
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