Student Login

Home›Chapters›Ray Optics PYQs›Prism, Dispersion & Scattering›Question 15

MHT CET 2026 (20 Apr, Shift 1) · Prism, Dispersion & Scattering

Prism, Dispersion & Scattering question from MHT CET 2026 (20 Apr, Shift 1)

Q15MHT CET 2026 · 20 APR · SHIFT 1Medium

Prism, Dispersion & Scattering

The prism has refracting angle A. The second refracting surface of the prism is silvered. Light ray falling on first refracting surface with angle of incidence $2A$ , reaches the second surface and returns back through same path due to reflection at the silvered surface. The refractive index of the material of prism is

Show answer and solution

Answer: (b)

To retrace its path, the ray must hit the silvered face normally: $r_2 = 0$ , so $r_1 = A$ .
Snell's law at the first face: $\sin 2A = \mu\sin A$
$\mu = \dfrac{2\sin A\cos A}{\sin A} = 2\cos A$
So the answer is (b) $2\cos A$ .

Report a mistake

More questions on Prism, Dispersion & Scattering

An achromatic convergent doublet of two lenses in contact has a power of +2D. The convex…MHT CET 2026 (15 May, Shift 1)
A thin prism with angle 5° of refractive index 1.72 is combined with another prism of…JEE Main 2026 (23 Jan, Shift 1)
The exit surface of a prism with refractive index n is coated with a material having…JEE Main 2026 (24 Jan, Shift 1)
Consider following statements for refraction of light through prism, when angle of…JEE Main 2025 (3 Apr, Shift 1)
Given below are two statements: one is labelled as Assertion (A) and the other is…JEE Main 2025 (7 Apr, Shift 2)
The refractive index of the material of a glass prism is √(3). The angle of minimum…JEE Main 2025 (23 Jan, Shift 2)
A ray of light suffers minimum deviation when incident on a prism having angle of the…JEE Main 2025 (2 Apr, Shift 2)
A monochromatic ray of light is incident normally on a thin prism of refracting angle A…MHT CET 2025 (26 Apr, Shift 1)