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Myopia and Its Correction

A person cann...

Question

A person cannot see objects clearly beyond 50cm. The power of lens to correct the vision is

A

+5D

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B

-2D

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C

-0.5D

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D

+2D

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Solution

The correct option is D -2D
A person cannot see beyond 50 cm. Hence, he should use a concave lens of 50 cm focal length.Hence $P o w e r = \frac{- 100}{50} = - 2 D$

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