is the bouncing back of a wave when it meets a surface or a boundary that is hard enough that it cant travel through .
is when waves pass the edge of an object or reach an opening, they will bend or spread as if a new wave were created there.
is the bending of waves when they pass from 1 medium to the next.
when you have two waves combine together to make bigger waves
when you have two ways that come together and isolate each other out
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