Ray Optics: Deviation by Prism MCQ

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Deviation by PrismMediumQuestion 20218

Question

Deviation δ of a ray through a thin prism (small angle A, refractive index n) is:

A
nA
B
(n−1)A
Correct
C
(n+1)A
D
A/n

Correct answer

(n−1)A

Explanation

For a thin prism (small A): δ ≈ (n−1)A. This is the standard result for paraxial rays in a prism — deviation is proportional to prism angle and depends on n.

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