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http://people.physics.tamu.edu/kochar/FE/FE_Fall05_1.pdf

Specifically, for the first part, what is going on...? Firstly, I have the equation that I = I

_{0}cos^2(phi). So if I want the intensity doubled then I end up with cos^2(phi) = 2, which isn't possible? Clearly I am thinking about this in the entirely wrong way and could use some help, thanks in advance.