What is the refraction of a wave and how can you draw it?

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Description

This video explains why a wave changes direction when it passes from one medium to another, in a process called refraction. The change in direction of a refracted wave can be drawn using a ray diagram, labelled with the Angle of Incidence (i) and Angle of Refraction ®.

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$What is the refraction of a wave and how can you draw it?$