formula to calculate wave front and tail time
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In physics, a wavefront is the locus of pointscharacterized by propagation of positions of identical phase: propagation of a point in 1D, a curve in 2D or a surface in 3D.[1] For an electromagnetic wave, the wavefront is represented as a surface of identical phase, and can be modified with conventional optics. For instance, a lens can change the shape of optical wavefronts from planar to spherical as the lens introduces a spatial phase variation across the beam shape.
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