JEE Main 2026 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 5 April 2026, Shift 1, Physics Q40

Question 40 of 75 in this shift, Physics question 15 of 25, Section A.

A ray of light passing through an equilateral prism is having velocity

2.12 \times 10^8

m/s in the prism material, then the minimum angle of deviation is ________ degrees.

(1)45
(2)30Official answer
(3)28
(4)58

Official answer

Option 2

NTA final key.

Chapter: Ray Optics and Optical Instruments
Topic: Prism Deviation
Idea tested: Minimum Deviation Condition

Same idea in other shifts

Asked 9× in all

2 Apr 2026, Shift 1 · Q40For a thin symmetric prism made of glass (refractive index $1.5$ ), the ratio of incident angle and minimum deviation will be _________.MediumSingle correct
3 Apr 2025, Shift 1 · Q41Consider following statements for refraction of light through prism, when angle of deviation is minimum. A. The refracted ray inside prism…MediumOther
6 Apr 2024, Shift 1 · Q51The refractive index of prism is $\mu = \sqrt{3}$ and the ratio of the angle of minimum deviation to the angle of prism is one. The value…MediumNumerical value
27 Jan 2024, Shift 1 · Q45If the refractive index of the material of a prism is $\cot\left(\frac{A}{2}\right)$ , where A is the angle of prism then the angle of…MediumSingle correct
31 Jan 2024, Shift 1 · Q45The refractive index of a prism with apex angle $A$ is $\cot A/2$ . The angle of minimum deviation is :MediumSingle correct
30 Jun 2022, Shift 1 · Q58The refractive index of an equilateral prism is $\sqrt{2}$ . The angle of emergence under minimum deviation position of prism, in degree,…EasyNumerical value
22 Jul 2021, Shift 2 · Q24A ray of light passing through a prism ( $\mu = \sqrt{3}$ ) suffers minimum deviation. It is found that the angle of incidence is double the…EasyNumerical value
25 Jul 2021, Shift 2 · Q17A prism of refractive index $\mu$ and angle of prism A is placed in the position of minimum angle of deviation. If minimum angle of…MediumSingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.