When reflections produce a single transverse wave, superposition happens. when two waves cross each other.
Destructive interference is when two waves superimpose on top of each other in the opposite phase, with the resultant wave's amplitude being equal to the individual waves' differences in amplitude and producing the least amount of light.
According to the concept of superposition, the cumulative displacement caused by several waves in a medium at a specific moment in time or space is equal to the sum of the individual displacements each wave has produced.
Superposition happens at every location and an interference pattern is produced when waves from two sources spread out and cross through a region of space.
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