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A diver at a depth of 12 m in water(mu=4...

A diver at a depth of 12 m in water`(mu=4/3)` sees the sky at a cone of semivertical ang

A

`sin^(-1)(4//3)`

B

`tan^(-1)(4//3)`

C

`sin^(-1)(3//4)`

D

`90^@`

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