Angle of incidence = Angle of reflection
The line traveling towards the barrier and the line traveling away from the barrier are the same angle.
The dashy line is called the 'normal'; it is always at a right angle to the barrier
An example of a wave being reflected is light on a mirror, as the light hits the barrier (the mirror) it reflects off. It reflects off at the same angle at which it started from, so if there was an image the light would reflect off it, onto the mirror and into your eye.
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