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2Pac

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In order to do this, you have two polarizers available. Prove that in order to get the maximum final intensity, you should choose to orient first polarizer at an angle φ=θ/2 from the initial polarization direction. (Note that to achieve the desired final polarization, you have no choice about how to orient the second polarizer.)

Anyone care to take a stab at this? I am unsure of how to go about proving this. Any help to point me in the right direction would be appriciated, thanks.