The power of a lens is measured in

watt

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horse power

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dioptre

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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, $D = \frac{1}{f}$
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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