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The near point of a person suffering from hypermetropia is at 50cm from his eye. What is the nature and power of the lens needed to correct this defect?

If you have hypermetropia, you should wear convex lenses.

Given,

u = -25cm object distance

v = -50cm image distance

1/v-1/u=1/f

100/f = 100/50 = 2D