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

Question

If the critical angle for total internal reflection from a medium to vacuum is 30 ° , the velocity of light in the medium is, 3 × 10 8 m s - 1, 1.5 × 1 0 8 m s - 1, 6 × 10 8 m s - 1, 3 × 10 8 m s - 1

MARKS App · Accepted Answer

The relative refractive index of denser medium with respect to the rarer medium is μ dr = μ d μ r sin ⁡ i c = 1 μ dr = μ r μ d = v d v r sin ⁡ 30 o = V d 3 × 1 0 8 ⇒ v d = 1.5 × 1 0 8 m s - 1

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