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The far point of a near sighted person is 00cm in front of eye. What is the nature and power of the lens required to enable him to see very distant object?

CBSE, class XIII guys.



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The person needs a concave lens. eye is not able to focus the rays on to retina. they are gettng converged in front of retina. so diverging lens needed - so the rays converge on retina.

1/v - 1/u = 1/f          u very high - infinity  =>  1/v = 1/f     
v = f    P = 1/f
Image should be formed at close distance to eye. so f is small and power is very very high.    The lens could be a (very thin at center & very thick at the ends ) concave lens with very little radius of curvature.
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The type of lens required by the person is a concave lens...HOPE IT HELPS...
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