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wavefront
A __________ is an imaginary surface that connects all the points of an electromagnetic wave that are in the same phase.
coherent waves
Coherent waves have constant phase and frequency, and travel in the same direction. They can come from one or multiple sources in phase. Examples are laser light and sound from one instrument. They can interfere constructively or destructively based on phase difference.
constructive interference
Constructive interference is the ___________ of two or more waves that results in a wave with a greater amplitude than the individual waves.
polarised waves
A __________ wave is a type of wave that oscillates in a single plane and has a defined direction of vibration perpendicular to the direction of propagation.
Note 
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