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Q.

A person can see objects clearly upto 5 m.  Power of lens needed to enable him to see object placed at 10 m will be

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a

−0.2D

b

0.2D

c

−0.5D

d

−0.1D

answer is D.

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Detailed Solution

P=1f=1v-1u=1-5-1-10=-2+110=-0.1D
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