Question

Define one dioptre of power of lense ?​

Answer 1

Answer:

ONE DIOPTRE IS THE POWER OF A LENS WHOSE FOCAL LENGTH IS ONE METRE.

P= 1/f

Answer 2

answer$\implies$

1 dioptre is SI unit of the power of a lens whose focal length is 1 metre. It is denoted by the letter D. Thus 1D = 1 m-1. Simply, when focal length ‘ f ‘ is expressed in metres, then, power is expressed in dioptres. The power of a convex lens is positive and that of a concave lens is negative.