Wavefronts and Rays•Wavefrontsare surfaces on which all points of a wave are in the same phase of motion.•Rays are lines that are perpendicular to the wavefronts and points in the direction of the wave.•In 3-dimensions, a point source(e.g. a pulsating tiny sphere) generates spherical wavefronts•Waves whose wavefronts are flat surfaces are called plane waves. The rays of a plane wave are parallel to each other.Spherical WavefrontsWavefrontsRays RaysPlane WavesSpherical Waves from a point source
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