First slide

Total internal reflection - Ray optics and optical instruments

Question

The critical angle for diamond (refractive index = 2) is

Easy

A

About 20°
B

60°
C

45°
D

30°

Solution

$μ = \frac{1}{sinC} \Rightarrow C = \sin^{- 1} (\frac{1}{2}) = 30^{\circ}$

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