A ray of light is incident at an angle i from denser to rarer medium the reflected and the refracted rays are mutually perpendicular
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then the light must incident at polarising angle.
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This is not a necessary condition but there is a speciality about such a case. Suppose it happens that the refracted ray and reflected ray are perpendicular to each other, the reflected light is plane-polarised.
The angle of incidence required for that to happen is called Brewster's angle which is the inverse tangent of refractive index.
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