Question

Focal length of the plano–convex lens is ____, when its radius of curvature of the surface is R and is the refractive index of the lens

(A) f = R

(B) f = \(\frac{R}{2}\)

(C) f = \(\frac{R}{(\text{n} -1)}\)

(D) f = \(\frac{(\text{n}-1)}{R}\)

Answer 1

(B) Optic center