Refraction happens when a wave like light changes ____. Medium means what the ____ is travelling through (we don't use the word ____ because some waves can travel through a ____ which is the absence of ____. Waves move faster in some mediums and slower in others. This depends on the ____. When a wave changes ____ it can change direction. If a wave slows down then its angle of refraction gets ____ (ray moves ____ the normal line). If a wave speeds up then its angle of refraction gets ____ (ray moves ____ ____ the normal line). If a ray hits a surface at ____ degrees to the surface it doesn't change ____ (but it still ____ ____.

Refraction

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