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What is the intensity of the transmitted light?

  1. Aug 2, 2011 #1
    1. The problem statement, all variables and given/known data
    Two polarizers are out of alignment by 30°. If light of intensity 3.86 W/m2 and initially polarized halfway between the polarizing angles of the two filters passes through the two filters, what is the intensity of the transmitted light?


    3. The attempt at a solution

    Use Malus' law:

    I = I0 * cos(theta)
    which gives me 3.34 W/m2

    but it's not right... any hints?
    should i divide it by 2 since it says that it is polarized halfway between ?
     
  2. jcsd
  3. Aug 2, 2011 #2

    kuruman

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    You have the wrong expression for Malus' law.
     
  4. Aug 2, 2011 #3
    i forgot square

    I = I0 * cos(theta)^2 other than that it's right
     
  5. Aug 2, 2011 #4

    kuruman

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    So how would you go about solving this now that you have the correct form of Malus' Law?
     
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