1.

A driver at a depth 12 m inside water (mu = 4//3) see the sky in a cone of semi-vertical angle is

Answer»

`sin^(-1)((4)/(3))`
`TAN^(-1)((4)/(3))`
`sin^(-1)((3)/(4))`
`90^(@)`

Solution :Required SEMI VERTICAL angle = Critical angle `i_(c ) -= sin^(-1) (1)/(mu)sin^(-1)((3)/(4))`


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