The resulting wave will have zero amplitude, thus it will form a straight line.
What is a crest?
A crest is an upward displacement of a progressive wave.
What is a trough?
A trough is a downward displacement of a progressive wave.
Superimposition of the two waves
When the two waves meet each other at point X, they will superimpose and cancel out since they have equal amplitude and are in opposite direction.
The resulting wave will have zero amplitude, thus it will form a straight line.
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