Definition:
Wave front: A locus of all the points of the medium to which waves reach simultaneously so that all the points are in the same phase is called wave front.
Wave normal: A perpendicular drawn to the surface of a wave front at any point of a wave front in the direction of propagation of light waves is called a wave normal.
Wave surface: The surface of sphere with source as center and distance traveled by light wave as radius where each wave arrives simultaneously is called wave surface.
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