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Direction of secondary wavefronts from the point sources

  1. Dec 1, 2013 #1
    1. The problem statement, all variables and given/known data

    My question is simple.

    2. Relevant equations

    Why do we not take the direction of secondary wavefronts from the point sources to be going backwards to the original direction of the wave as a whole?

    3. The attempt at a solution

    Thanks to you! :D
     
  2. jcsd
  3. Dec 1, 2013 #2

    mfb

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    2016 Award

    Staff: Mentor

    You can do that, but then you have to do it at every point in space, and as a result those contributions usually* cancel each other.

    *you did not give the setup, so it is hard to tell
     
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