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Wave
,→About Waves
: [[Wave]]s travel through a [[medium]] that allows the [[vibration]].
When a [[wave]] meets a boundary between two [[material]]s it can be:
*[[Absorb (Physicsphysics)|Absorbed]] - The [[wave]] disappears and the new material gains [[energy]] from the [[wave]].
*[[Reflection|Reflected]] - The [[wave]] bounces off the new [[material]].
*[[Refraction|Refracted]] - The [[wave]] enters the new [[medium]] changing direction as it does.