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Homework Help: Polarization question

  1. Mar 22, 2004 #1
    Hello everyone. I wanted to make sure I did this problem correctly. The problem is this:
    A light with an intensity of 75 W/m^2 is shone through three polarized lenses. The first lens is tilted at a 37 degree angle, the second is at a 10 degree angle and the final lens is titled by 82 degrees. Find the final intensity of the light.

    So this is my work:

    75 W/m^2 X 1/2 (half of the light is filtered through the first lens) X cos^2(37-10) X cos^2(82-10) = 2.84 W/m^2

    Is this the proper way to do this problem? This is the way our example from class was calculated, but I was a little bit hazy on the details, so I wanted to make sure that I did the work right. Thank you all.
  2. jcsd
  3. Mar 23, 2004 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Yes. I didn't check your arithmetic, but your method is correct.
  4. Mar 23, 2004 #3
    Thank you very much. I've been away from this stuff for so long that it makes me question my methods at times.
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