JEE Main 2020 — Wave Optics Question with Solution
From: JEE Main 2020 (Online) 4th September Morning Slot
Question
A beam of plane polarised light of large
cross-sectional area and uniform intensity
of 3.3 Wm-2 falls normally on a
polariser (cross sectional area 3 10-4 m2) which
rotates about its axis with an angular speed
of 31.4 rad/s. The energy of light passing through
the polariser per revolution, is close to :
cross-sectional area and uniform intensity
of 3.3 Wm-2 falls normally on a
polariser (cross sectional area 3 10-4 m2) which
rotates about its axis with an angular speed
of 31.4 rad/s. The energy of light passing through
the polariser per revolution, is close to :
Choose an option
Show full solutionCorrect option: B
Correct answer
B1.0 10-4 J
Step-by-step explanation
Intensity, I = 3.3 Wm–3
Area, A = 3 × 10–4 m2
Angular speed, = 31.4 rad/s
= , in one time period
and
Area, A = 3 × 10–4 m2
Angular speed, = 31.4 rad/s
= , in one time period
and
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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.