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Grade 12 2-D Wave Interference

  1. Dec 17, 2012 #1
    Hello and thank you!

    I am having trouble understanding Mr. Thomas Young's equations for the double-slit apparatus with the bands etc.

    Specifically, for constructive interference:
    Length = PS1-PS2 = n(lamda)

    What I understand is that this n value is the phase shift in their wavelength. (i.e. one whole wavelength, a half a wavelength, etc.)

    But for destructive interference, the formula is:
    Length = PS1-PS2 = (n-0.5)(lamda)

    Why is 0.5 being subtracted? I do not understand conceptually.
  2. jcsd
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