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[" A diver at a depth of "12m" in water ...

[" A diver at a depth of "12m" in water "(mu=4/3)" sees the sky in a cone of semi-vertical angle "],[[" (a) "sin^(-1)(4/3)," (b) "tan^(-1)(4/3)," (c) "sin^(-1)(3/4)," (d) "90^(@)]]

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