An overhead projector is turned on so its light shines on the screen at the fron

Question

An overhead projector is turned on so its light shines on the screen at the front of the classroom. The light from the projector is unpolarized, and the intensity of the light reaching the screen is 380 W/m2.

A single polarizer is then placed on the projector, so the light passes through the polarizer before reaching the screen. The transmission axis of the polarizer is aligned at a +48.0° angle (see the picture to see exactly what direction this is).

An overhead projector is turned on so its light shines on the screen at the front of the classroom. The light from the projector is unpolarized, and the intensity of the light reaching the screen is 380 W/m2. A single polarizer is then placed on the projector, so the light passes through the polarizer before reaching the screen. The transmission axis of the polarizer is aligned at a +48.0° angle (see the picture to see exactly what direction this is) 0° -30 +30 -60° +60° +90° (a) What is the intensity of the light reaching the screen now? 190

Explanation / Answer

Intensity of light coming from projector I = Io*(costheta)^2

Io = 380 W/m^2

theta = 48

I = 380*(cos48)^2

I = 170 W/m^2

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