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Need help with question regarding polarization filters

  1. Nov 17, 2015 #1
    • Moved from a technical forum, so homework template missing
    Un-polarized light is incident upon two polarization filters and do not have their transmission axes aligned. If 18% of the light passes through this combination of filters, what is the angle between the transmission axes of the filters.

    I got 64 degrees using I = Imax(cosΦ)^2 but the correct answer is 53 degrees.

    Thank you very much!!
     
  2. jcsd
  3. Nov 17, 2015 #2

    DrClaude

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    Staff: Mentor

    What happens when the light hits the first filter?
     
  4. Nov 17, 2015 #3
    The light will be linearly polarized. If the first filter is ideal, intensity of the transmitted light will be exactly half that of the incident un-polarized light.
     
  5. Nov 17, 2015 #4

    DrClaude

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    Staff: Mentor

    Correct. So how does that affect the terms in your equation?
     
  6. Nov 17, 2015 #5
    I got it!
    Thank you very much!
    Sorry for the trouble!
     
  7. Nov 17, 2015 #6

    DrClaude

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    Staff: Mentor

    No trouble, that what PF is for!
     
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