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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