A beam of light strikes a piece of glass at an angle of incidence of 60° and the reflected beam is completely plane polarised. The refractive index of the glass is:
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Question

A beam of light strikes a piece of glass at an angle of incidence of 60° and the reflected beam is completely plane polarised. The refractive index of the glass is:

G1 Physics · Accepted Answer

Complete polarization of the reflected beam means Brewster incidence. Brewster's law gives n=tan60°=√3. Option B.