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Homework Help: Thin-Film Interference

  1. Apr 11, 2007 #1
    Light of wavelength 654 nm (in vacuum) is incident perpendicularly on a soap film (assume n = 1.32) suspended in the air. What are the two smallest nonzero film thicknesses (in nm) for which the reflected light undergoes constructive interference?
    __________nm (smallest thickness)
    __________nm (next smallest thickness)

    Info: Thin-Film Interference
  2. jcsd
  3. Apr 12, 2007 #2

    Doc Al

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    Staff: Mentor

    Please show what you've done so far and where you are stuck. (Hint: Consider the interference between light reflecting from the top and bottom surfaces of the soap film.)
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