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Introduction
Coherence and Interference are two ideal wave features that complement each other,.The wave interference interference do occur but for it it to be considered constructive,it it needs the coherence of some of some of the physical quantities of the waves involved; the wavelength, amplitude, and phase of the constituent wave forms must be identical.The most distinct concept of coherence in waves cohering requires that they ( waves) must be in phase -requires that the wave are in phase,their peaks are line up with alinged with each other.