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Interference of Waves
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The principle of superposition
Two or more waves meet, the total displacement at any point is the vector sum of the displacements that each individual wave would cause at that point
Coherent wave
Two wave sources which are coherent have same frequency or have constant phase difference
Wave interference
The effect of superposition of two coherent waves
Constructive interference
Superposition of two waves of equal phase to produce waves with maximum amplitude
Destructive interference
Superposition of two different phases of waves (antiphase) produces a wave with zero amplitude
Peak meets peak yield higher peak (amplitude 2a)

The diagram shows the change of amplitude
Trough meets trough results in higher wave trough (amplitude -2a)

The diagram shows the change of trough
Peak and trough produce a wave with zero amplitude

Diagram shows collision of peak & trough during wave interference
Monochromatic light
Light with only one colour
Formula to calculate wavelength of lightwave
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