Calculate the critical angle for total internal refection of light travelling from (i) water into air (ii) glass into water. Given `.^(a)mu_(w)` and `.^(a)mu_(g) = 1.5`
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When light travels from water to air, `.^(a)mu_(g) = (1)/(sin C)` `sin C = (1)/(.^(a)mu_(w)) = (1)/(1.33) = 0.7518` `:. C = sin^(-1)(0.7518) = 48^(@)44'` (ii) When light travels from glass into water `.^(a)mu_(g) = (1)/(sin C'), i.e., (.^(a)mu_(g))/(.^(a)mu_(w)) = (1)/(sin C')` or `(1.5)/(1.33) = (1)/(sin C')` or `sin C' = (1.33)/(1.5) = 0.8866` `:. C' = sin^(-1)(0.8866) = 62^(@)27'`
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