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Homework Help: A thin film problem?

  1. Aug 3, 2010 #1
    1. The problem statement, all variables and given/known data

    A glass (Refractive index 1.33) is coated with a thin film. (Refractive index 1.50)

    Find the minimum thickness of the film, if the glass is to transmit light of wavelength λ.

    2. Relevant equations

    3. The attempt at a solution

    Light reflected from the upper surface of the film will suffer phase difference. That's all I know about this problem. Are we looking for constructive interference or destructive interference?
  2. jcsd
  3. Aug 3, 2010 #2
    No help?
  4. Aug 3, 2010 #3


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    Staff Emeritus
    Science Advisor
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    It sounds like they probably want 100% transmission, so constructive interference for transmission, destructive for reflection.
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