State and define the S.I. unit of power of a lens.
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Power of lens is the ability of the lens to converge the rays of light falling on it. It can also be defined as $\text{P}=\frac{1}{\text{f}}$ where f is the focal length. Dioptre is the S.I. unit of power of lens. One Dioptre is the power of a lens whose focal length is 1 metre.
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