A beam of randomly polarized light with intensity 41 W/m2 is sent rightward thro

Question

A beam of randomly polarized light with intensity 41 W/m2 is sent rightward through THREE polarizing sheets. The randomly polarized wave is shown below moving rightward toward Sheet 1. The polarizing direction of Sheet 1 is vertical. The polarizing direction of Sheet 2 makes a 45 degree -angles with the vertical. The polarizing direction of Sheet 3 makes a 65 degree -angle with the vertical. What is the Intensity of the light after it passes through Sheet 1 before reaching Sheet 2? What is the Intensity of the light after it passes through Sheet 2 before reaching Sheet 3? What is the Intensity of the light after it passes through Sheet 3?

Explanation / Answer

Part A)

After sheet 1, half of the intensity goes through

(.5)(41) = 20.5 W/m^2

Part B)

After sheet 2

cos^2(45) = .5

I = (.5)(.5) = .25

.25(41) = 10.25 W/m^2

Part C)
cos^2(20) = .883

(.5)(.5)(.883) = .221

I = (.221)(41) = 9.05 W/m^2

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