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JEE Main 2026 (23 Jan, Shift 1) · Prism, Dispersion & Scattering

Prism, Dispersion & Scattering question from JEE Main 2026 (23 Jan, Shift 1)

Q17JEE Main 2026 · 23 JAN · SHIFT 1Medium

Prism, Dispersion & Scattering

A thin prism with angle $5^\circ$ of refractive index 1.72 is combined with another prism of refractive index 1.9 to produce dispersion without deviation. The angle of second prism is ______.

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Answer: (b)

No deviation: $(\mu_1 - 1)A_1 = (\mu_2 - 1)A_2$ .
$0.72 \times 5^\circ = 0.9 \times A_2$
$A_2 = 4^\circ$
So the answer is (b) $4^\circ$ .

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