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

Select the correct statement.

An unpolarized light is incident from air on the boundary of a denser medium having refractive index $\mu$ at polarizing angle $i_p$. Which of the following is correct?

If the polarizing angle for a medium is $60^\circ$,then the critical angle for that medium is . . . . . .

$A$ ray of light is incident at a polarising angle such that its deviation is $24^{\circ}$. Then the angle of incidence is: (in $^{\circ}$)

When the angle of incidence on a material is $60^\circ,$ the reflected light is completely polarized. The velocity of the refracted ray inside the material is (in $m/s$)