If the critical angle for total internal reflection from a medium to vacuum is `30^(@)`, then velocity of light in the medium is

Options

A. `6 xx 10^(8) m//sec`
B. `2 xx 10^(8) m//sec`
C. `3 xx 10^(8) m//sec`
D. `1.5 xx 10^(8) m//sec`

Answer

A, C

Explanation

`mu = (1)/(sini_(c)) = (c )/(v)`