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Is energy conserved for light?

  1. Jan 25, 2005 #1
    In interferance fringes, at the points where the destructive interferance takes place isn't energy lost...?

    So therefore isn't the law of conservation of energy at stake?
  2. jcsd
  3. Jan 25, 2005 #2
    No because the energy fluctuates with time and the energy-value that is used for conservation laws is the mean energy-value which can be calculated out of the given fluctuating energy and it is independent of time

  4. Jan 25, 2005 #3
    For every destructive interference fringe giving 0, there is a constructive interference fringe giving 2E.
  5. Jan 25, 2005 #4


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    Staff: Mentor

    No, it's just redistributed to the points where constructive interference occurs. The maxima of the interference pattern are brighter than the light would be at those points if there were no interference.
  6. Jan 25, 2005 #5
    Ahhhh, right.. thx guyz....
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