The sources of the waves must be coherent, which means they emit identical waves with a constant phase difference. The waves should be monochromatic - they should be of a single wavelength.
In physics, interference is the overall result of two or more wave trains travelling in parallel or converging directions. At each place impacted by many waves, the effect is that of adding the individual wave amplitudes.
Interference comes in two flavours positive interference and destructive interference. Additionally, when wave amplitudes reinforce one another and cause an increase in wave amplitude, constructive interference occurs.
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