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NEET 2026 · Prism, Dispersion & Scattering

Prism, Dispersion & Scattering question from NEET 2026

Q1NEET 2026Easy

Prism, Dispersion & Scattering

A ray of monochromatic light is passing through an equilateral prism $(ABC)$ as shown in the figure. The refracted ray $(QR)$ is parallel to its base $(BC)$ and the angle of incidence $(i)$ is $50^\circ$ . Then the angle of deviation $(\delta)$ is:

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Answer: (c)

Ray parallel to base in an equilateral prism means minimum deviation, so $i = e$ .
$\delta = i + e - A = 2i - A$
$\delta = 2(50^\circ) - 60^\circ = 40^\circ$
So the answer is (c) $40^\circ$ .

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