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

MCQ

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

A
About $20^{\circ}$
B
$60^{\circ}$
C
$45^{\circ}$
✓
$30^{\circ}$

✓

Answer

Correct option: D.

$30^{\circ}$

$\mu=\frac{1}{\sin C} \Rightarrow C=\sin ^{-1}\left(\frac{1}{2}\right)=30^{\circ}$

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