Unpolarized light with I=120 w/m^2 travels in the x direction and passes through

Question

Unpolarized light with I=120 w/m^2 travels in the x direction and passes through a linearly polarizing film oriented in the z direction, and then another linearly polarizing film oriented in the y direction. A) What is the intensity of the beam after passing through the first film? B) what is the intensity of the beam after passing through the second film? C) Suppose I place a third film between the other two, oriented 30 degrees with respect to the z direction. What is the final intensity of the beam passing through all three polarizing films?

Explanation / Answer

A) I = Io/2 = 120 / 2 = 60w/m^2 B) after passing through the second film = 0 C) after 1 60 after 2 60 cos^2 30 = 45 after 3 45 cos^2 60 = 11.25 w/m^2 final intensity of the beam = 11.25 w/m^2

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