Question

what is lens maker's formula?​

Answer 1

Lenses. Lens Maker's Formula. Using the positive optical sign convention, the lens maker's formula states. where f is the focal length, n is the index of refraction, and and are the radii of curvature of the two sides of the lens.

Answer 2

formula for lens is

P = 1/-f

and

1/f= 1/v-1/u

but for ur answer

first one is most appropriate