Question

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

Answer 1

m = \(\frac{1}{sin\ C} = \frac{1}{sin\ 30} = \frac{2}{1} = 2\) 

or \(\frac{c}{v} = 2\)

or \(u = \frac{c}{2} = \frac{3 \times 10^8}{2} \) = 1.5 x 10⁸ ms^-1