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QJEEM23Ph1a75: JEE Main 2023 Physics - Class 12 JEEM23Ph1a75 Solution: As shown in the figure, three identical polaroids P , P and P…

As shown in the figure, three identical polaroids P 1_1 , P 2_2 and P 3_3 are placed one after another. The pass axis of P 2_2 and P 3_3 are inclined at angle of 60 ∘^\circ and 90 ∘^\circ with respect to axis of P 1_1 . The source S has an intensity of 256 Wm2\frac{W}{m^2} . The intensity of light at point O is ____________ Wm2\frac{W}{m^2} .

JEE Main 2023 (Online) 29th January Morning Shift Physics - Wave Optics Question 43 English

Step-by-Step Verified Solution

By first polaroid P1 intensity will be halved then P2 and P3 will make intensity cos⁡2(60∘)\cos ^{2}\left(60^{\circ}\right) and cos⁡2(30∘)\cos ^{2}\left(30^{\circ}\right) times respectively.

Intensity out =2562×14×(32)2=256×32×4×4=24=\frac{256}{2} \times \frac{1}{4} \times\left(\frac{\sqrt{3}}{2}\right)^{2}=\frac{256 \times 3}{2 \times 4 \times 4}=\mathbf{2 4}

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