A ray of light strikes a glass plate at an angle of incidence `57^(@)`. If the reflected and refracted rays are perpendicular to eachother, calculate critical angle for total internal reflection at glass air interface.
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Here, as reflected and refracted rays are perpendicular, therefore, `I = 57^(@) =` polarising angle `(i_(p))` `mu = tan i_(p) = tan 57^(@) = 1.5398` If `C` is critical angle for TIR at glass air interface, then `sin C = (1)/(mu) = (1)/(1.5398) = 0.6494` `C = sin^(-1) (0.6494) = 40.5^(@)`
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