When a light ray is incident on the surface of a medium,the reflected ray is completely polarized. Then the angle between the reflected and refracted rays is (in $^{\circ}$)

An unpolarised light beam strikes a glass surface at Brewster's angle. Then

The angle of incidence at which reflected light is totally polarized for reflection from air to glass (refractive index $n$) is

Select the correct statement.

The refractive index of a material is equal to the tangent of the polarising angle. This is called:

$A$ beam of light $AO$ is incident on a glass slab $(\mu = 1.54)$ in a direction as shown in the figure. The reflected ray $OB$ is passed through a Nicol prism. On viewing through the rotating Nicol prism,we find that $(\tan 57^{\circ} = 1.54)$.