JEE Main 2022 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 29 July 2022, Shift 2, Physics Q39

Question 39 of 90 in this shift, Physics question 9 of 30, Section A.

An unpolarised light beam of intensity

2I_0

is passed through a polaroid P and then through another polaroid Q which is oriented in such a way that its passing axis makes an angle of

30^\circ

relative to that of P. The intensity of the emergent light is

(1) $\frac{I_0}{4}$
(2) $\frac{I_0}{2}$
(3) $\frac{3I_0}{4}$ Official answer
(4) $\frac{3I_0}{2}$

Official answer

Option 3

NTA final key.

Chapter: Wave Optics
Topic: Polarization
Idea tested: Malus's Law Calculation

Same idea in other shifts

Asked 7× in all

4 Apr 2026, Shift 2 · Q42An unpolarized light of certain intensity passes through a combination of two polarizers whose transmission axes are at $30^\circ$ and…MediumSingle correct
6 Apr 2026, Shift 1 · Q47An unpolarized light of intensity $I_0$ passes through polarizer and then through a certain optically active solution and finally it goes…MediumNumerical value
30 Jan 2024, Shift 2 · Q45A beam of unpolarised light of intensity $I_o$ is passed through a polaroid $A$ and then through another polaroid $B$ which is oriented so…EasySingle correct
10 Apr 2023, Shift 1 · Q57Unpolarised light of intensity $32\,Wm^{-2}$ passes through the combination of three polaroids such that the pass axis of the last…MediumNumerical value
30 Jul 2022, Shift 2 · Q14Two poloroids P $_1$ and P $_2$ are placed parallel to each other with common axis.The light of intensity I $_0$ passes through a polaroid…EasySingle correct
24 Feb 2021, Shift 1 · Q22An unpolarized light beam is incident on the polarizer of a polarization experiment and the intensity of light beam emerging from the…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.