The refractive index of water is `4//3` and that of glass is `3//2`. A beam of light enters glass from water. For what angle of incidence will the refracted light be completely polarised ?
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Here, `.^(a)mu_(w) = 4//3, .^(a)mu_(g) = 3//2` `.^(w)mu_(g) = (.^(a)mu_(g))/(.^(a)mu_(g)) = (3//2)/(4//3) = (9)/(8) = 1.125` For beam travelling from water to glass, `tan i_(P) = .^(w)mu_(g) = 1.125` `i_(P) = tan^(-1)(1.125) = 48^(@)22'`
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