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How does an eye focus the object lying a...

How does an eye focus the object lying at various distances?

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The eye can focus the images of the distant objects as well as that of the nearby objects on its retina by changing the focal length of its lens. The focal length of the eye lens is changed by the action of the ciliary muscles. The ciliary muscles can change the thickness of the eye lens and hence its focal length changes the converging power of the eye lens.
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