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Physics · Geometrical Optics

JEE Main 2025 — 3 April, Morning Shift — Question 47

Consider following statements for refraction of light through prism, when angle of deviation is minimum.

A. The refracted ray inside prism becomes parallel to the base.

B. Larger angle prisms provide smaller angle of minimum deviation.

C. Angle of incidence and angle of emergence becomes equal.

D. There are always two sets of angle of incidence for which deviation will be same except at minimum deviation setting.

E. Angle of refraction becomes double of prism angle.

Choose the correct answer from the options given below:

  1. Option A:

    A, B and E only

  2. Option B:

    B, D and E only

  3. Option C:

    B, C and D only

  4. Option D:

    A, C and D only

    Correct

Answer: D

Step-by-step solution

Because of symmetry where i=ri=r, and r=A2r=\frac{A}{2}

δ=(μ−1)A\delta=(\mu-1) A

(A) is correct

(B) is incorrect

(C) is correct

(D) is correct as δ=i+e−A\delta=i+e-A

(E) is incorrect

Solution figure

Answer key and solution verified before publishing.

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Exam
JEE Main 2025
Paper
3 April, Morning Shift
Subject
Physics
Chapter
Geometrical Optics
Topic
Apparent Depth, Glass Slab, Prism and Dispersion

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