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A ray of light strikes a piece of glass at an angle of incidence of $60^{\circ}$ and the reflected beam is completely plane polarised. The refractive index of glass is
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The correct answer is:
$\sqrt{3}$
According to Brewster's law, reflected light is plane polarised if unpolarised light falls at the interface of air and medium at an angle $\mathrm{i}_{\mathrm{p}}$ called polarising angle then
$\mu=\tan \mathrm{i}_{\mathrm{p}} \Rightarrow \mu(\text { glass })=\tan 60^{\circ}=\sqrt{3}$
$\mu=\tan \mathrm{i}_{\mathrm{p}} \Rightarrow \mu(\text { glass })=\tan 60^{\circ}=\sqrt{3}$
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