Unpolarized light with intensity I0 is incident on an ideal polarizing filter. T

Question

Unpolarized light with intensity I0 is incident on an ideal polarizing filter. The emerging light strikes a second ideal polarizing filter whose axis is at 40.0degrees to that of the first. Determine the intensity of the beam after it has passed through the second polarizer.

B. Consider the vector shown with the tilted coordinate system. (Figure 1) If the magnitude of the vector is A, what is the magnitude of the ycomponent Ay of the vector?

Express your answer in terms of A and use degrees for any angles.

Explanation / Answer

let's say the first filter polarizes vertically
an ideal filter would only let 1/2 of the unpolarized light through
then
the second filter would only let ( I cos40 ) through
so
Io * 1/2 * cos40 = 0.3830 Io

y component is Ay=Acos(40)

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