A ray of light is incident on a glass sphere of refractive index 3//2 What should be the angle of incidence so that the ray which enters the sphere does not come out of the sphere?

A ray of light is incident on a glass sphere of refractive index 3//2

1.	A ray of light is incident on a glass sphere of refractive index 3//2 What should be the angle of incidence so that the ray which enters the sphere does not come out of the sphere?
Answer» `tan^-1(2//3)` `sin^-1(2//3)` `90^@` `cos^-1(1//3)` ANSWER :C