Simulation of a wave changing as it passes from one medium to another

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This is a simulation that you can download and run on your Windows computer. You are looking at a simulation of how a wave changes as it passes from one medium to another. An example of this is when light passes from air to glass.
In this simulation the wave is traveling from left to right. The dark black line in the center of the graph represents where the two materials or "mediums" join together, this is called the boundary.