alleryA thin prism of refracting angle 5° is made of glass with n = 1.5. The deviation δ of a light ray passing through it is approximately
A7.5°
B2.5°
C5.0°
D1.25°
Answer & Solution
Correct answer: B. 2.5°
1. δ = (n − 1) A for a small-angle prism.
2. δ = (1.5 − 1) × 5° = 0.5 × 5° = 2.5°.
3. (A) uses A/4; (C) ignores the (n − 1) factor; (D) doubles incorrectly.
_Source: syllabus Physics Part II, Ch 9 §9.6_
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