Home Physics Ray Optics Prism Theory & Dispersion of Light When a ray of light is incident normally on …
Physics Ray Optics Prism Theory & Dispersion of Light MCQ (Single Correct)

When a ray of light is incident normally on one refracting surface of an equilateral prism (Refractive index of the material of the prism = 1.5

A
Emerging ray is deviated by 30 o
B
Emerging ray is deviated by 45 o
C
Emerging ray just grazes the second refracting surface
D
The ray undergoes total internal reflection at the second refracting surface

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The correct answer is:
D

Critical angle for the material of prism since angle of incidence at surface is greater then the critical angle so total internal reflection takes place.

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