When unpolarised light from air incidents on the surface of a medium of refractive index $\sqrt{3}$, then the reflected light is totally polarised. The angle of refraction is
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Brewster's Law ($\tan\theta_B = n$) gives the polarizing angle. A key property at this angle is that the reflected and refracted rays are perpendicular to each other ($i+r=90^\circ$). This provides a quick way to find the angle of refraction once the angle of incidence is known.