When two or moare than two wvaes supermpose over each other at a common partile of the medium then the resultant diaplacement (y) of the particle is equal to the vector sum of the displacements (y₁ and y₂) produced by personal rays. i.e. 

Important Terms:

1. Phase : The argument of sine or cosine in the expression for displacement of a wave is defined as the phase. For displacement y = asinωt; term ωt= phase or instantaneous phase.

2. Phase difference (Φ) : The difference between the phases of two waves at that position is called phase difference i.e. if y₁ = a₁sinωt and y₂ = a₂sin(ωt+Φ) so phase difference ¾ Φ

3. Path difference (D) : The difference in path length's of two waves meeting at that position is called path difference between the waves at that position. Also 

4. Time difference (T.D.) : Time difference between the waves meeting at a point is 

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