First slide
Diffraction of light-Wave Optics
Question

A ray of light is incident on the surface of a glass plate at an angle of incidence equal to Brewster's angle ϕ. If μ represents the refractive index of glass with respect to air, then the angle between reflected and refracted rays is 

Easy
Solution

At polarizing angle, the reflected and refracted rays are mutually perpendicular to each other. 

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