Question

Unpolarised light is incident on a plane glass surface. What should be the angle of incidence so that the reflected and refracted rays are perpendicular to each other?

Answer 1

The angle of incidence so that the reflected and refracted rays are perpendicular to each other is 56.31 degree

1. The condition for the reflected and refracted rays are perpendicular to each other is
2. The angle of incident is should be equal to angle of polarisation
3. Polarising angle is $tan(i_{p} )= n$ here n is the refractive index of the material
4. The refractive index of the glass are around n = 1.5
5. The angle of incidence so that the reflected and refracted rays are perpendicular to each other is
6. $i_{p}=tan^{-1}(1.5)=56.31$ degree