please show work and explain. A linearly polarized electromagnetic wave is sent

Question

please show work and explain.

A linearly polarized electromagnetic wave is sent through two sheets of polarizing material. The first sheet, A, is oriented so that its transmission axis makes an angle of 30 degree with respect to the incident electric field of the wave. The second sheet, B, is oriented so that its transmission axis makes an angle of 90 degree with the incident electric field of the wave. The incident beam has an electric field of peak magnitude E0 and average intensity S0. What is the average intensity of the wave after it passes through A? 0.75S0 0.50S0 0.87S0 0.60S0 0.30S0

Explanation / Answer

S=S0*[cos(theta)]^2

so after the 1st polarizer

S1=S0*[cos(30 degrees)]^2=0.75*S0

==> option A

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