Question

Relation between angle of polarisation and critical angle

Answer 1

When the unpolarized light incident on the interface of two different medium (with two different refractive index n1 and n2) at an perticular angle such that reflected and refracted light are polarized and the angle between reflected and refracted light is 90°, this perticular angle is called polarising angle. It is also known as Brewster's angle θB.

 

when unpolarized light incident on a boundary at polarizing angle θB, the reflected light consists only of components perpendicular to the plane of incidence  and refracted light consists only of components parallal to the plane of incidence.

 

θB = tan-1 (n2/n1)