Physics · 2020
JEE Main · 4 September 2020, Shift 1 · Q17
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…
A beam of plane polarised light of large cross-sectional area and uniform intensity of $\displaystyle 3.3 \mathrm{Wm}^{-2}$ falls normally on a polariser (cross sectional area $\displaystyle 3 \times 10^{-4} \mathrm{~m}^2$ ) which rotates about its axis with an angular speed of $\displaystyle 31.4 \mathrm{rad} / \mathrm{s}$. The energy of light passing through the polariser per revolution, is close to :
Official answer
(2)
$\displaystyle 1.0 \times 10^{-4} \mathrm{~J}$
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