For the same angle of incidence, the angles of refraction in media A, B, C and D are 50°, 40°, 30° and 20° respectively. The speed of light is minimum in medium (a) A (b) B (c) C (d) D

Answer: (d). Snell's law: n = (sin i)/(sin r); for the same i, smallest r gives largest n. Speed v = c/n is minimum where n is maximum, i.e. r = 20°. So the answer is (d) D.

For the same angle of incidence, the angles of refraction in media A… | MHT CET 2026 (15 May, Shift 2)

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Refraction, Glass Slab & Apparent Depth

For the same angle of incidence, the angles of refraction in media A, B, C and D are $50^\circ,\ 40^\circ,\ 30^\circ$ and $20^\circ$ respectively. The speed of light is minimum in medium

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Answer: (d)

Snell's law: $n = \frac{\sin i}{\sin r}$ ; for the same $i$ , smallest $r$ gives largest $n$ .
Speed $v = \frac{c}{n}$ is minimum where $n$ is maximum, i.e. $r = 20^\circ$ .
So the answer is (d) D.

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