Q.How the eye of a person suffering from myopia can be corrected ? Explain with the help of ray diagram.

A myopic eye focuses distant objects in front of the retina; placing a diverging (concave) lens of the correct power in front of the eye brings the focus back exactly onto the retina.

In myopia, the eyeball is too long (or the eye lens too strongly converging), so parallel rays from a distant object converge to a point IN FRONT of the retina, and only nearby objects (up to the eye's 'far point', which is closer than infinity) can be focused sharply.

Correction with a concave lens:

A concave (diverging) lens of focal length equal to (negative of) the distance to the person's far point is placed in front of the eye. It diverges the incoming parallel rays from a distant object just enough that, after passing through the lens, they appear to originate from the eye's far point rather than from infinity. The eye's own lens can then bring these rays to a sharp focus exactly on the retina.

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