Plane wave terminology - opracowanie

Plane wave terminology In the above equation the first factor changes amplitude, the second changes phase. The
directions of maximum rates of change of amplitude and phase are α and β respectively.
The plane perpendicular to β is a plane of constant phase; that such planes exist is why
solutions of this type are called plane waves. The plane perpendicular to α is a plane of
constant amplitude. If such variations of amplitude exist, i.e. if α 6= 0, the wave is called
a non-uniform plane wave. If no such variation of amplitude exists, i.e. if α = 0, the wave
is called a uniform plane wave.
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