What is meant by power of lens?what does its sign (+ve or -ve) indicate
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power of lens is reciprocal of focal length and it is negative in concave lens and positive in convex lens It's unit is dioptre when focal length is in metre
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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'.
Power of a lens is the reciprocal of its focal length.
Dioptre is the S I unit of power of lens.
One Dioptre is the power of a lens whose focal length is 1 metre.
It indicates both signs.
Convex lens has positive power while concave lens has negative power.
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