When an unpolarised light beam is incident from air onto glass $(n = 1.5)$ at the polarising angle:

Select the correct statement.

Unpolarised light is incident from air on a plane surface of a material of refractive index $\mu$. At a particular angle of incidence $i$,it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation?

If the polarising angle for an air-glass interface is $56.3^o$,what is the angle of refraction in glass (in $^o$)?

Can reflection result in plane polarised light if the light is incident on the interface from the side with higher refractive index?

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