An unpolarized light incident on a plane glass surface gets totally polarized on reflection. If the refractive index of glass is \(\tan 57^{\circ}\), then the angle of refraction is
\(33^{\circ}\)
Total polarisation of reflected light occurs at the Brewster angle: \(\mu=\tan i_B\)
\(\tan i_B=\tan57^{\circ}\Rightarrow i_B=57^{\circ}\)
At the Brewster angle the reflected and refracted rays are perpendicular: \(i_B+r=90^{\circ}\)
\(r=90^{\circ}-57^{\circ}=33^{\circ}\)
Hence, 33°.
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