JEE Main 2020 — Wave Optics Question with Solution
From: JEE Main 2020 (Online) 7th January Morning Slot
Question
A polarizer - analyser set is adjusted such that the intensity of light coming out of the analyser is just 10% of the original intensity. Assuming that the polarizer - analyser set does not absorb any light, the angle by which the analyser need to be rotated further to reduce the output intensity to be
zero, is :
Choose an option
Show full solutionCorrect option: C
Correct answer
C18.4o
Step-by-step explanation
I = I0 cos2
= I0 cos2
cos =
= 71.6o
= 90 - 71.6 = 18.4o
= I0 cos2
cos =
= 71.6o
= 90 - 71.6 = 18.4o
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This is a previous-year question from JEE Main 2020, 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.