What is the S.I. unit of power of a lens?

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Dioptre

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answer is A.

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Detailed Solution

The reciprocal of a lens's focal length is known as its power. The letter P is used to symbolize it.

$P = \frac{1}{f}$ gives the power P of a lens (in Dioptre) with a focal length of f (in m).

"Dioptre" is the SI unit for a lens's power.

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