Question

1.Find the focal length of plano convex lens, when its radius of curvature
of the surface is R and n is th refractive index of the lens ?​

Answer 1

Answer:

f=r/2so find the ans by this

Answer 2

Explanation:

we know that

1/ f = (n-1)R

where

n=refractive index

R=radius of curvature

now

atq

1/f=(n-1)R

f=1/(n-1)R

hope it helps

you