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JEE MAIN 2020
04-09-2020 S1
Question
A beam of plane polarised light of large crosssectional area and uniform intensity of 3.3 $\mathrm{Wm}^{-2}$ falls normally on a polariser (cross sectional area $3 \times 10^{-4} \mathrm{~m}^2$ ) which rotates about its axis with an angular speed of $31.4 \mathrm{rad} / \mathrm{s}$. The energy of light passing through the polariser per revolution, is close to
Select the correct option:
A
$1.0 \times 10^{-5} \mathrm{~J}$
B
$1.0 \times 10^{-4} \mathrm{~J}$
C
$5.0 \times 10^{-4} \mathrm{~J}$
D
$1.5 \times 10^{-4} \mathrm{~J}$
✓ Correct! Well done.
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