Question

what is the power of lens. write it's unit.​

Answer 1

Answer:

The power of a lens is defined as the reciprocal of the focal length. Lens power is measured in dioptres (D). 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.

unit one dioptre

Answer 2

Answer:

dioptre

Power of lens is defined as ability of a lens to converge / diverge a beam of light rays falling on lens . Power of lens is reciprocal of focal length where p is power of lens and f is focal length. S.l. unit of power is dioptre