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Find the final transmitted intensity (as a percentage of the incident intensity) for unpolarized light passing...

Find the final transmitted intensity (as a percentage of the incident intensity) for unpolarized light passing through two polarizers 90° apart.   Do it again for three polarizers 45° apart from each other. For 9 polarizers all 10° apart. I want to rotate an incident light beam by 90°.  I'll do it by using 181 polarizers in a chain, all separated by 1/2°.   Repeat the calculation for initially unpolarized light and tell me the final transmission intensity. What if instead I used initially polarized light that was oriented the same way as the first polarizer.   Repeat the 181 polarizers.

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