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Light of 500nm wavelength is reflected

  1. May 11, 2012 #1
    1. The problem statement, all variables and given/known data

    Hi:redface:

    Light of 500nm wavelength is reflected from a thin film of air between two glass plates. The thickness of the film is 1000mn.

    a) How much farther does the light reflected from bottom surface travels than the light reflected from the top of the film (assuming normal incidence)?

    b) How many wavelength of light does this represent?


    2. Relevant equations

    λ ≈ 2d

    3. The attempt at a solution

    For a)

    λ = 2(1000nm) = 2000nm

    For b)

    2000nm/500nm = 4

    Is it correct?:confused:
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. May 11, 2012 #2

    collinsmark

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    Gold Member

    It looks correct to me. :approve:

    The variable λ is conventionally reserved for the wavelength of the light involved (not necessarily the extra distance traveled). So your use of 'λ' is a somewhat unconventional. However, your numerical answers look correct to me.
     
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