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Magnification by Thin Lenses

The power of ...

Question

The power of a lens is inversely proportional to :

image distance

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object distance

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focal length

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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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What is the nature and focal length of the lens If the power of a lens is $+ 0.1 D$ ?

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60 c m,

d

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