Calculate the speed of light in a medium whose critical angle is 30°.

Explanation

Here, `i_( c) = 30^(@)`
`therefore` Refractive index of medium `n=1/(sin i_( c)) =1/(sin 30^(@)) =1/(1/2) = 2.0`
`therefore` Speed of light in the given medium `v=c/n = (3 xx 10^(8))/2 = 1.5 xx 10^(8) ms^(-1)`