Published by:
CGP EDU Academic Team
Published on: August 21, 2026
A ray is incident at an angle of incidence i on one surface of a small angle prism (with angle of prism A) and emerges normally from the opposite surface. If the refractive index of the material of the prism is 
, then the angle of incidence is nearly equal to :
A
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
Light ray emerges normally from another surface, hence,
angle of emergence, e = 0
Angle of refraction across second surface, r 2 = 0
r 1 + r 2 = A
r 1 = A
Applying Snell's law on first surface, we get,
Now, for small angle the angle of incidence will be
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