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The axes of a polarizer and an analyzer ...

The axes of a polarizer and an analyzer are oriented at right angles to each other. A third Polaroid sheet is placed between them with its axis at `45^(@)` to the axes of the polarizer and analyzer.
(a) If unpolarized light of intensity `I_(0)` is incident on this system, what is the intensity of the transmitted light?
(b) What is the intensity of the transmitted light when the middle Polaroid sheet is removed?

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