When two waves pass through a medium at a point, then the resultant displacement at that point is the vector sum of the displacements due to two component waves. This modification in displacement as a result of superposition of two waves is called INTERFERENCE.
The phenomenon in which two waves traveling in same direction reinforce each other at some points and cancel the effect of each other at some different points is called Interference of waves.
CONSTRUCTIVE INTERFERNCE: -
Type of interference in which two waves overlap each other in such a way that they reinforce or increase the effect of each other is called Constructive Interference.
In constructive interference crest of one wave coincides that crests of other and trough coincides with trough.
In constructive interference path difference of two waves is 'm λ’
DESTRUCTIVE INTERFERENCE: -
Type of interference in which two waves overlap each other in such a way that they cancel the effect of each other is called Destructive Interference.
In destructive interference crest on wave coincides the trough the other wave.
In destructive interference path difference of two waves is (m + ½) λ.
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