Question

If the critical angle for total internal reflection from a medium to vacuum is 30° , then velocity of light in the medium is

(a) 6 x 10⁸ m/sec 

(b) 2 x 10⁸ m/sec 

(c) 3 x 10⁸ m/sec 

(d) 1.5 x 10⁸ m/sec

Answer 1

(c) 3 x 10⁸ m/sec 

 μ = \(\frac{1}{sin_{ic}}\) =\(\frac{c}{v}\)