JEE Main 2022 · PhysicsMultiple choiceSingle correctMediumApplication

JEE Main 28 June 2022, Shift 1, Physics Q42

Question 42 of 90 in this shift, Physics question 12 of 30, Section A.

The refracting angle of a prism is A and refractive index of the material of the prism is cot (A/2). Then the angle of minimum deviation will be -

(1) $180 - 2A$ Official answer
(2) $90 - A$
(3) $180 + 2A$
(4) $180 - 3A$

Official answer

Option 1

NTA final key.

Chapter: Ray Optics and Optical Instruments
Topic: Prism Deviation
Idea tested: Prism Refractive Index

Same idea in other shifts

Asked 3× in all

6 Apr 2026, Shift 2 · Q42Angle of minimum deviation is equal to the half of the angle of prism in an equilateral prism. The refractive index of the prism is…EasySingle correct
2 Apr 2025, Shift 2 · Q49A ray of light suffers minimum deviation when incident on a prism having angle of the prism equal to $60^\circ$ . The refractive index of…EasyNumerical value

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.