Question

A parralell beam of radiation is incident first on

Answer 1

Answer:

Sphere is considered as a solid transparent with two

Spherical refractive surface of radius of curvature r1=r2=r

The image is formed at 2r distance from the pole of the 1st surface and so no refraction takes place in the second surface.

effectively refraction takes place in single surface and image is formed inside the refractive medium.

∴n1u+n2v=n2−n1r

n1- refractive index of air

n2 - refractive index of medium =μ

u=∞

v=2r

1∞+μ2r=(μ−1)r

μ=2μ−2

μ=2