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

Options

A. `3xx10^(8)` m/s
B. `1.5xx10^(8)` m/s
C. `6xx10^(8)` m/s
D. `sqrt(3)xx10^(8)` m/s

Answer

B

Explanation

`sinC=(1)/(mu)=(v)/(c)`
or `v=csinC=3xx10^(8)sin30^(@)=1.5xx10^(8)` m/s