Plane Wave
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High Quality Content by WIKIPEDIA articles! In the physics of wave propagation, a plane wave (also spelled planewave) is a constant-frequency wave whose wavefronts (surfaces of constant phase) are infinite parallel planes of constant amplitude normal to the phase velocity vector. The wavefronts of a plane wave traveling in 3-space A pseudo-colored upward-traveling plane wave in 2-space By extension, the term is also used to describe waves that are approximately plane waves in a localized region of space. For example, a localized source such as an antenna produces a field that is approximately…mehr

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High Quality Content by WIKIPEDIA articles! In the physics of wave propagation, a plane wave (also spelled planewave) is a constant-frequency wave whose wavefronts (surfaces of constant phase) are infinite parallel planes of constant amplitude normal to the phase velocity vector. The wavefronts of a plane wave traveling in 3-space A pseudo-colored upward-traveling plane wave in 2-space By extension, the term is also used to describe waves that are approximately plane waves in a localized region of space. For example, a localized source such as an antenna produces a field that is approximately a plane wave in its far-field region. Equivalently, for propagation in a homogeneous medium over lengthscales much longer than the wavelength, the "rays" in the limit where ray optics is valid correspond locally to approximate plane waves.