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Q.

A person cannot see distinctly at the distance less than one metre. Calculate the power of the lens that he should use to read a book at a distance of 25 cm

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a

+ 3.0 D

b

+ 0.125 D

c

– 3.0  D

d

+ 4.0 D

answer is A.

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Detailed Solution

P=1f=−1v+1u=−1100+125=3100=+3D
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A person cannot see distinctly at the distance less than one metre. Calculate the power of the lens that he should use to read a book at a distance of 25 cm