Question

how can you double the power of the lens? shw necessary calculation​

Answer 1

Answer:

The diopter is the unit of measure for the refractive power of a lens. The power of a lens is defined as the reciprocal of its focal length in meters, or D = 1/f, where D is the power in diopters and f is the focal length in meters. Lens surface power can be found with the index of refraction and radius of curvature.

A thick convex lens has more power than a thin one because it has greater curvature or lesser focal length than a thin lens.