JEE Main 2020 Physics question
A beam of plane polarised light of large cross-sectional area and uniform intensity of 3.3 falls normally on a polariser (cross sectional are ) 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-
Answer: (B)
Solution
Average power through the polariser = ½ I A = 4.95 × 10⁻⁴ W (as in the paper's working);
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