What is the power of converging lens having a focal length of 20 cm?
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Answer: A diopter is a unit of measure for the power of a refrective index of a lens.
It is usually the reciprocal of the focal length of a lens.
It is denoted by D.
Formula:D=1/f where f is the focal length and D is the power of the lens in Diopter.
We first convert cm to meters.
20/100=0.2m
D=0.2
=5 Diopters
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