Question

The near point of a hypermetropic eye is 50cm. What is the narure and power of the lens required to enable him to tead abook placed at 25 cm from the eye?

Answer 1

for a hypermetropic eye u=-25cm and v=-50cm

substituting in the lens formula we get focal length is f=50cm =0.5m

from the formula P=1/f

P=1/0.5  2D

so the power of the lens is 2 dioptre and the nature of lens is a converging lens or a convex lens

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