State and define the S.I. unit of power of a lens.
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Answer:
the SI unit of power of lens is Dioptre which is expressed as D.
1D=1/m¹
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Power of lens
Explanation:
(a) The ability of a lens to converge or diverge a beam of the light ray is known as the Power (P) of the lens. Power is equal to the reciprocal of the focal length. So P = 1/f
(b) SI unit of the power of a lens is Dioptre and it is denoted by D.
1 diopter = 1/ 1m = 1 m^-1 where 1 m is the focal length.
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