A particular beam of light, with an intensity of 420 W/m2, is linearly polarized

Question

A particular beam of light, with an intensity of 420 W/m2, is linearly polarized at an angle of +8.00° to the vertical. You have three polarizers, which have their transmission axes aligned as follows:
Polarizer A - the transmission axis is at +12.0° to the vertical;
Polarizer B - the transmission axis is at +78.0° to the vertical;
Polarizer C - the transmission axis is at +33.0° to the vertical.

You will select two of these polarizers, and have the light pass through one and then the other.

If you want to maximize the intensity of the light emerging from the second polarizer, which two polarizers should you select, and in what order should the light pass through them?

Explanation / Answer

Since the intensity transmitted is based on the formula

I = Iocos2, you need the smallest angles. The cos is larger, the smaller the angle. Therefore you need

Polarizer A then Polarizer C

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