First slide

Total internal reflection - Ray optics and optical instruments

Question

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

Moderate

A

$3 \times 10^{8} m / s$
B

$1 .5 \times 10^{8} m / s$
C

$6 \times 10^{8} m / s$
D

$\sqrt{3} \times 10^{8} m / s$

Solution

$μ = \frac{1}{\sin C} = \frac{1}{\sin 30} = 2 ∴ v = \frac{3 \times 10^{8}}{2} = 1 .5 \times 10^{8} m / s$

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