A monochromatic light is incident at a certain angle on an equila… - Vidyadip

MCQ

A monochromatic light is incident at a certain angle on an equilateral triangular prism and suffers minimum deviation. If the refractive index of the material of the prism is $\sqrt 3$ , then the angle of incidence....$^o$

A
$90$
B
$30$
✓
$60$
D
$45$

✓

Answer

Correct option: C.

$60$

c
$i=\theta$

$r_{1}=r_{2}=\frac{A}{2}=30^{\circ}$

by Snell's law

$1 \times \sin i = \sqrt 3 \times \frac{1}{2} = \frac{{\sqrt 3 }}{2}$

$i=60$

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