Reflection
Leaving Cert Physics · Waves and Energy Transfer
Higher Level
The return of a wave into the same medium after it strikes a boundary, with the angle of incidence equal to the angle it leaves at, both measured from the normal. This is what allows a plane mirror to form an image behind it.
Ordinary Level
The bouncing back of light or sound when it hits a surface. A mirror image and an echo are both caused by it.
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