What do you mean by power of a lens? What is the SI unit of the
power of a lens? Calculate the power of a concave lens of focal
length 25 cm.
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Explanation:
Power of lens is the ability of the lens to converge the rays of light falling on it. It can also be defined as P=1/f where f is the focal length. S.I. unit of power is D(Dioptre). It is represented by letter 'P'.
A dioptre (British spelling) or diopter (American spelling) is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal length measured in metres. (1 dioptre = 1 m−1.) It is thus a unit of reciprocal length.
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Answer:
power of lens is the ability of lens to converge or diverge the Ray of light falling on it
SI unit is diaptor(D)
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