A diver at a depth of 12 m in water `(mu=4 //3)` sees the sky in a cone of semi-vertical angle

Options

A. `sin^(-1)((4)/(3))`
B. `tan^(-1)((4)/(3))`
C. `sin^(-1)((3)/(4))`
D. `90^(@)`

Explanation

We can represent this diagrammatically as,

Thus, we see that `C=sin^(-1)((1)/(mu))=sin^(-1)((3)/(4))`