First slide

Total internal reflection - Ray optics and optical instruments

Question

The critical angle for a medium is 60°. The refractive index of the medium is

Moderate

A

$\frac{2}{\sqrt{3}}$
B

$\frac{\sqrt{2}}{3}$
C

$\sqrt{3}$
D

$\frac{\sqrt{3}}{2}$

Solution

$μ = \frac{1}{\sin C} = \frac{1}{\sin 60^{\circ}} = \frac{2}{\sqrt{3}}$

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