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MHT CET 2024 (16 May, Shift 2) · Refraction, Glass Slab & Apparent Depth

Refraction, Glass Slab & Apparent Depth question from MHT CET 2024 (16 May, Shift 2)

Q24MHT CET 2024 · 16 MAY · SHIFT 2Medium

Refraction, Glass Slab & Apparent Depth

A ray of light travelling through a rarer medium is incident at very small angle ' $i$ ' on a glass slab and after refraction its velocity is reduced by $25\%$ . The angle of deviation is

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Answer: (b)

Speed drops by $25\%$ : $v = 0.75c \Rightarrow \mu = \dfrac{4}{3}$ .
For small angles $r = \dfrac{i}{\mu} = \dfrac{3i}{4}$ .
Deviation $\delta = i - r = \dfrac{i}{4}$ .
So the answer is (b).

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