Find the angle of refraction in a medium `(mu=2)` if light is incident in vacuum, making an angle equal to twice the critical angle.

Explanation

Since the incidient light is in rarer medium. Total internal Reflection can not take place.
`C = sin^(-1) (1)/(mu) = 30^(@) rArr :. I = 2C = 60^(@)`
Appyling Snell's Law. `1sin 60^(@) = 2sin r`
`sin r = (sqrt(3))/(4) rArr r = sin^(-1) ((sqrt(3))/(4))`.