Question

If the critical angle for total internal reflecting from medium to vacuum is 30, the velocity of light n the medium is

विकल्प

• 3 × 10⁸m/s

• 1.5 × 10^–8m/s

• 6 × 10⁸m/s

• `sqrt(3)` × 10⁸m/s

Answer 1

1.5 × 10^–8m/s

Explanation:

`mu = C/2 = 1/sinc = 1/(sin 30) = 1/1` = 2

V = `C/2 = (3 xx 10^8)/2` = 1.5 × 10^–8 ms^–1