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Gr.12 Thin Films Question.

  1. Jan 7, 2010 #1
    1. The problem statement, all variables and given/known data
    Light of wavelength 580 nm strikes a soap film (n=1.33), which is surrounded by air. What is the minimum thickness needed to produce
    a) dark spot?
    b) bright spot?

    2. Relevant equations
    n1/n2=wavelength 2 / wavelength 1

    2t = m (wavelength) <-- dark
    2t = (m + 1/2) (wavelength) <--- bright
  2. jcsd
  3. Jan 8, 2010 #2


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    Homework Helper

    Those equations are right. Just plug in the numbers are you're done.
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