Question

define power of a lense . what is si unit of it​

Answer 1

Answer:

reciprocal of foacal length in meters is called power of lens

Explanation:

P = 1 / f

its unit is dioptre

1 D = 1 / m

Answer 2

Answer:

The power of a lens is defined as the reciprocal of the focal length. ... Converging (convex ) lenses have positive focal lengths, so they also have positive power values. Diverging (concave ) lenses have negative focal lengths, so they also have negative power values.