Two linear polarizers are placed in a row. The first has its transmission axis θ1 = 50° (counterclockwise) from vertical while the second polarizer has its transmission axis oriented θ2 = 31° (clockwise) from vertical, as shown below. A beam of vertically polarized light with initial intensity I0 goes through the two polarizers.

What is the ratio of the final electric field E2 to the initial electric field E0?

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I know the answer is E2 / E0 = 0.10...

I just need someone to explain to me why this is the anser