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Homework Help: Thickness of Film

  1. Apr 28, 2009 #1
    1. The problem statement, all variables and given/known data
    Light of wavelength 547nm is incident perpendicularly on a soap film (n=1.31) suspended in air. What is the smallest nonzero film thickness for which reflected light undergoes constructive interference?

    2. Relevant equations
    2t = (m + 1/2)(wavelength/nfilm)

    3. The attempt at a solution
    t = (0+1/2)(547nm/(2*1.31))
    t = 104 nm

    Is this correct?

    Could someone please check this as well: https://www.physicsforums.com/showthread.php?t=310439
  2. jcsd
  3. Apr 28, 2009 #2
  4. Apr 28, 2009 #3


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    Homework Helper

    It is correct.
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