At what angle `theta` above the horizon should the sun be situated so that its light reflected from the surface of still water in a pond is completely polarised. Take `mu = 1.327 and tan 53^(@) = 1.327`.
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The reflected light will be completely polarised, when `I = i_(P)`, so that `theta = (90 - i_(P))` As `mu = tan i_(P)` `1.327 = tan i_(P) : i_(P) = tan^(-1) (1.327) = 53^(@)` `:. Theta = 90^(@) - i_(P) = 90^(@) - 53^(@)` `= 37^(@)`
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