JEE Main 2019 — Wave Optics Question with Solution
From: JEE Main 2019 (Online) 12th April Evening Slot
Question
A system of three polarizers P1, P2, P3 is set up such that the pass axis of P3 is crossed with respect to that of P1.
The pass axis of P2 is inclined at 60o to the pass axis of P3. When a beam of unpolarized light of intensity I0 is
incident on P1, the intensity of light transmitted by the three polarizers is I. The ratio () equals (nearly) :
Choose an option
Show full solutionCorrect option: A
Correct answer
A10.67
Step-by-step explanation
When unpolarized light of intensity I0 passes through P1, then intensity
I1 =
as we know, I = I0 cos2
Given that angle between P2 & P3 = 60o and
P1 and P3 are crossed that means angle between P1 and P3 is 90o
so angle between P1 and P2 = 90° – 60° = 30°
I2 = =
I3 = = = I
= = = 10.67
I1 =
as we know, I = I0 cos2
Given that angle between P2 & P3 = 60o and
P1 and P3 are crossed that means angle between P1 and P3 is 90o
so angle between P1 and P2 = 90° – 60° = 30°
I2 = =
I3 = = = I
= = = 10.67
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This is a previous-year question from JEE Main 2019, covering the Wave Optics chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.