The refractive index of water is 4 / 3 and that of glass is 5/3. What will be the critical angle for the ray of light entering water from the glass

Options

A. `sin^(-1) (4/5)`
B. `sin^(-1)(5/4)`
C. `sin^(-1)(1/2)`
D. `sin^(-1)(2/1)`

Answer

A

Explanation

`mu = (mu_1)/(mu_2) = (5//3)/(4//3) = 5/4`
`sin C = 1/(mu) = 4/5`