Question

A short sighted person cannot see clearly beyond 2m. calculate the power of lens required to correct his vision

Answer 1

Explanation:

Here, u = - infinity, v = - 2m (or -200cm)

1/f = 1/v - 1/u

1/f = -1/2 + 1/infinity

therefore, f=-2m

P = 1/f = -1/2 = - 0.5 D

hence power of lens req is - 0.5 D

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