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Ø Introduction
Coherence and Interference are two ideal wave features that complement each other.The wave interference  do occur but for it  to be considered constructive interference,it  needs the coherence 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 requires that  the wave  are in  phase,their peaks are aligned with each other. 

Ø Coherence

Wiki MarkupThis is a property holding for two or more waves with logical and consistent ability of sticking together, it is a wave  feature marked with an orderly correlation between waves having identical physical quantities.Coherence describes all properties of the correlation between physical quantities of a single wave, or between several waves or wave packets.\[1\of sticking together, it is a wave  feature marked with an orderly correlation between waves having identical physical quantities."Coherence describes all properties of the correlation between physical quantities of a single wave, or between several waves or wave packets".[1]