Question

Light enters at an angle of incidence in a transparent rod of refractive index l so what value of the refractive index of the material of the roads

Answer 1

(a)

Let a ray of light enter at A and the refracted beam is AB. This is incident at an angle q.

For no refraction at the lateral face, q > C or, sin q > sin C

But q + r = 90° Þ q = (90° - r)