Thin Films again - Help?

  1. 1. The problem statement, all variables and given/known data

    A camera lens (n = 1.90) is coated with a thin film of magnesium fluoride (n = 1.40) of thickness 90.0 nm. What wavelength in the visible spectrum is most strongly transmitted through the film?


    2. Relevant equations

    ?

    3. The attempt at a solution

    I have no idea where to start, is there an equation that will use both n's at once?
     
  2. jcsd
  3. rl.bhat

    rl.bhat 4,433
    Homework Helper

    Search in Google for thin film interference.
     
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