Define power of Len\'s

1.	Define power of Len\'s
Answer» The ability of the lens to diverge or converge the rays falling on its surface is called power of lens Power of a lens is the reciprocal of its focal length.S.I. Unit = Dioptre ot DExample: A lens of focal length 10 cm then find its power?We know, P=100/f(in cm) or P=1/f(in m)So,P=100/10P=10 D.

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