Question

what is meant by power of lens?write is SI unit

Answer 1

The angle of convergence and divergence of a lens is called power of lens.It's SI units are  dioptre (D).

Answer 2

Hey



Power of lens is defined as the reciprocal of it's focal length , given that the focallength must be in metre .

It's unit is Dioptre and symbolized by D .

so , P = 1 / f


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