Hand lens has power 10 D. Calculate how far from the lens must the book be held to read.
1 Answer
Given,
power = 10 D
focal lengthg = ??
We know ,
formula for focal length is
f= 1/ P
f = 1/10
f = 0.1 m
f = 10 cm.
Therefore the focal length should be or the distance of the book from lens should be 10 cm.
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