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## anonymous 5 years ago how do I calculate intensity of beam after polarization?

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1. anonymous

The intensity after passing through the first polaroid is I/2 where I is the Original intensity. after passing through the 2nd polaroid the intensity is $I \cos ^{2}\phi/2$ [Malus Law]

2. anonymous

where phi is the angle the 2nd polaroid makes with the first.

3. anonymous

half the intensity is theta/2? I haven't seen that before can you explain why its theta/2

4. anonymous

lozoot93: thanks for your answer! Romero: half the intensity is the Original intensity (I) divided by 2 as shown in the equation; the theta belongs to the cos^2

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