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Friday, 9 October

JEE Main 2026 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 4 April 2026, Shift 2, Physics Q42

Question 42 of 75 in this shift, Physics question 17 of 25, Section A.

An unpolarized light of certain intensity passes through a combination of two polarizers whose transmission axes are at 30∘30^\circ and 90∘90^\circ, respectively, with respect to the horizontal axis. A third polarizer with its transmission axis at 60∘60^\circ with the horizontal axis is placed between the two existing polarizers. The ratio of the output intensities with and without the third polarizer is ________.
  1. (1)3/4
  2. (2)4/3
  3. (3)9/4Official answer
  4. (4)4/9

Official answer

Option 3

NTA final key.

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

Same idea in other shifts

Asked 3× in all
  1. 6 Apr 2026, Shift 1 · Q47An unpolarized light of intensity I0I_0 passes through polarizer and then through a certain optically active solution and finally it goes…MediumNumerical value
  2. 30 Jan 2024, Shift 2 · Q45A beam of unpolarised light of intensity IoI_o is passed through a polaroid AA and then through another polaroid BB which is oriented so…EasySingle 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 42 of the 174 JEE Main shifts held from 2017 to 2026.