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JEE Main 2026 (22 Jan, Shift 1) · Prism, Dispersion & Scattering

Prism, Dispersion & Scattering question from JEE Main 2026 (22 Jan, Shift 1)

Q13JEE Main 2026 · 22 JAN · SHIFT 1Medium

Prism, Dispersion & Scattering

Consider an equilateral prism (refractive index $\sqrt{2}$ ). A ray of light is incident on its one surface at a certain angle $i$ . If the emergent ray is found to graze along the other surface then the angle of refraction at the incident surface is close to ______

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Answer: (d)

Grazing emergence means $r_2$ equals the critical angle: $\sin r_2 = \frac{1}{\sqrt{2}} \Rightarrow r_2 = 45^\circ$ .
$r_1 + r_2 = A = 60^\circ \Rightarrow r_1 = 15^\circ$
So the answer is (d) $15^\circ$ .

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