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A person cannot see distinctly objects kept beyond $2 m$ . What would be the power of the lens required to correct this condition?

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0.5 D

- 0.5 D

0.2 D

- 0.2 D

answer is B.

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Detailed Solution

A person cannot see distinctly objects kept beyond

2 m

. The power of the corrective lens will be

- 0.5 D

.
It is known that the power of the lens is given by

P = 1 / f

, where f is the focal length in m.
Let us consider the focal length as 2 m. Therefore,

P = - 1 / 2

= > P = - 0.5 D

Hence, the power of the lens will be

- 0.5 D

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