A coherent source refers to a source that emits waves with a constant phase relationship. In other words, the crests and troughs of the waves are aligned and maintain their positions over time.
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The phenomenon that occurs when two or more waves overlap and combine either constructively (amplitude increases) or destructively (amplitude decreases).
A device consisting of many closely spaced slits or grooves that can separate incoming light into its component wavelengths.
Huygens' Principle: A principle stating that every point on a wavefront acts as a source of secondary spherical wavelets that spread out in all directions.