A person is not able to read from a book until he keeps it at 50cm. determine the power of corrective lens

Answers (1)

Since the person is able to read clearly from a distance of 50 cm, 
focal length required = 50 cm = 0.5m

Now using

Power=1/f

Where f is in meter

we get

P=\frac{1}{0.5}=2 D

So the Power of corrective lens is 2D

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