As shown in figures, three identical polaroids ${P}_{1}$ , ${P}_{2}$ and ${P}_{3}$ are placed one after another. The pass axis of ${P}_{2}$ and ${P}_{3}$ are inclined at angle of $60 º$ and $90 º$ with respect to axis of ${P}_{1}$ . The source $S$ has an intensity of $256W{m}^{- 2}$ . The intensity of light at point $O$ is _____ $W{m}^{- 2}$ .

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As shown in figures, three identical polaroids P _ 1 , P _ 2 and P _ 3 are placed one after another. The pass axis of P

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As given here, the pass axis of P _ 2 and P _ 3 are inclined at angle of 60 º and 90 º with respect to axis of P _ 1 . Therefore, intensity of light after falling on first polaroid P _ 1 , I _ 1 = I _ 0 2 Intensity of light after falling on second polaroid P _ 2 , I _ 2 = I _ 1 ^ 2 60 ° = I _ 0 8 Intensity of light after falling on third polaroid P _ 3 , I _ 3 = I _ 2 ^ 2 30 ° = I _ 0 8 ((3)/(4)) = 3 I _ 0 32 The intensity of light at O is 3 I _ 0 32 = (3 × 256)/(32) = 24W m ^ - 2

As shown in figures, three identical polaroids P _ 1 , P _ 2 and P...

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