A Ondes Planes : Explication et Signification

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A plane wave like cos x lacks physical reality as it extends infinitely in the y and z directions. Despite this, it serves as a useful approximation in various scenarios due to its simplicity. Plane waves are significant because they allow for the representation of any real wave packet through Fourier decompositions. This includes both Fourier series and transforms, which facilitate analysis and understanding of complex waveforms. Overall, while idealized, plane waves play a crucial role in wave theory and applications.
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Pourquoi une onde plane n'a pas de réalité physique
 
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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.
 
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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