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A Soap Flim Index

  1. Apr 29, 2009 #1
    1. The problem statement, all variables and given/known data
    A soap film has an index of refraction n = 1.90. The film is viewed in reflected light.
    (a) At a spot where the film thickness is 910.0 nm, which visible wavelengths are missing in the reflected light? (Give the three wavelengths which correspond to the lowest such m values, in order of increasing m.)

    Which visible wavelengths are strongest in reflected light? (Give the three wavelengths which correspond to the lowest such m values, in order of increasing m.)



    2. Relevant equations


    EPD = 2t + Φ
    constructive interference: mλ where m {0, 1, 2, 3…}
    destructive interference: ½(2m -1)λ where m {1, 2, 3...}
    3. The attempt at a solution

    no idea - help me please!
     
  2. jcsd
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