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^(@)`

Answer

C

Explanation

(d) We can represent this diagrammatically as,

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