Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Polarization of light

  1. May 4, 2012 #1
    1. The problem statement, all variables and given/known data
    Two polarizers are oriented at 40deg to each other and plane-polarized light is incident on them. If only 15% of the light gets through both of them, what twas the initial polarization directon of the incident light?


    2. Relevant equations



    3. The attempt at a solution
    I think it ha something to do with Malus's Law but I'm not sure exactly how
     
  2. jcsd
  3. May 5, 2012 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    welcome to pf!

    hi xQuin! welcome to pf! :wink:

    yes, assume that the angle of polarization to the first polarizer is θ …

    how much goes through the first polarizer, and how much of that goes through the second?

    show us what you get :smile:
     
  4. May 5, 2012 #3
    Thanks tim, I applied the law twice and managed to get an answer of 59.6deg =D
     
  5. May 5, 2012 #4

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    looks good! :smile:
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook