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+1 vote
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State and define the SI unit of power of a lens.

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The reciprocal of focal length of the lens is called the power of the lens (P). 

P (in dioptre) =\(\frac{1}{f(in\, meters)}\) 

The S.I unit of power of lens is diopter denoted by D. 

From the formula of power of lens. 

1 D = \(\frac{1}{1m}\)= 1m-1

Thus 1 Dioptre is the power of the convex lens having focal length of 1m.

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