Define power of lens and also define it\’s SI unit
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The ability of a lens to converge/diverge a beam of light rays is expressed in terms of its power (p). It is the inverse of focal length, f (in meters).Hence, power of a lens is given by the relationP = 1/fThe SI unit of power is dioptre(D).
Dioptere
The ability to diverge or converge a light ray is known as power of lense