Question

what do u mean by power of lens ?? what sign it indicates??

Answer 1

Power of lens is the reciprocal of the focal length which is in meters.
The SI unit of power of lens is Dioptre (D).
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Answer 2

Power of lens is the reciprocal of focal length.
It is the degree of convergence or divergence of light rays.
It is denoted by dioptre (D).