Question

There is a prism with refractive index equal to √2
and the refracting angle equal to 30°. One of the
refracting surfaces of the prism is polished. A
beam of monochromatic light will retrace its path
if its angle of incidence over the refracting surface
of the prism is
(a) 0° (b) 30°
(c) 45° (d) 60°

Answer 1

Answer:

angle of incidence is 30°