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A Onde plane

  1. Mar 12, 2016 #1
    Pourquoi une onde plane n'a pas de réalité physique
  2. jcsd
  3. Mar 12, 2016 #2


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    Hello Ben, :welcome:

    A plane wave such as ##\cos x## has no physical reality because it goes on to infinity in the y and z directions. It is, hoewever, a very good approximation in many situations, and easier to deal with than a representation of a more realistic wave.
  4. Mar 13, 2016 #3


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    The most important feature of plane waves is that you can represent any real wave packet in terms of Fourier decompositions of plane waves (Fourier series and transforms).
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