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Question

The power of a lens is measured in

A
watt
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B
horse power
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C
dioptre
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D
m
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Solution

The correct option is D dioptre
The power of a lens is defined as the reciprocal of its focal length.
Power of lens, D=1f
Where D is the power in dioptre and f is the focal length in meters.
Also, watt and horse power are units of energy and m is the unit of length.
Hence, the correct answer is OPTION C.

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