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Magnification by Thin Lenses

The power of ...

Question

The power of a lens is inversely proportional to :

A

image distance

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B

object distance

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C

focal length

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D

none of these

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Solution

The correct option is A focal length
The power of a lens is defined as the reciprocal of its focal length (in metres). Its unit is dioptre.
$p = \frac{1}{f}$

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