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If the angle between the pass axes of a ...

If the angle between the pass axes of a polariser and analyser is `45^@` . Write the ratio of the intensities of original light and the transmitted light after passing through the analyser.

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As by Malus law, `I = I_0 cos^2 theta`
Therefore, `I_0//I = 1//cos^2 theta = 1//cos^2 45^@ = (1/(1//sqrt(2)))^(2) = 2`.
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