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Homework Help: Amplitude and Young double slit experiment

  1. Jan 15, 2016 #1


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    1. The problem statement, all variables and given/known data
    For a question in a worksheet (the actual question is irrelevant), my physics teacher said, in the context of the Young double slit experiment with light, if you make one of the slits smaller, then the amplitude of light from that source will also decrease.
    Is that true?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Jan 16, 2016 #2


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    How did your teacher define light amplitude?
    As far as I know, the amplitude of light is most often associated with the intensity. If the two slits is illuminated by a plane wave, the intensity and hence the amplitude across the slit opening is uniform. Reducing the slit size will obviously not affect the intensity, instead, it's the power (energy/time) which is decreasing.
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