Question

3) Focal length of the plano-convex lens is when its radius of curvature of the surface is R and n is the refractive index of the lens .

a) f=R
b)f=R/2
c)f=R/(n-1 )
d)f=(n-1)/R​

Answer 1

Answer:

ok mam f=r/(n-1)

Explanation:

please mark me as BRAINLEAST

Answer 2

Answer:

b is the correct option

as the focal length of a lens is half of its radius of curvature