Surface of constant phase

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surface of constant phase

If a solution to any wave equation has a time-harmonic (sinusoidal) solution (exact or approximate) of the form
ams2001glos-Se86
where the amplitude A and phase φ are functions of position, the equation
ams2001glos-Se87
defines a surface of constant phase.

If A is a scalar, the equation
ams2001glos-Se88
defines a surface of constant amplitude.