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Pourquoi une onde plane n'a pas de réalité physique
Ondes Planes : Explication et Signification
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Hello Ben, 
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.
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.
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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).