Refraction is the name used to describe light changing direction., A straw in a glass of water appears to bend in two., Light changes speed when it moves from one medium to another., A medium can be a solid, liquid or gas., Light travels faster through air than through liquid., When light travelling through air enters a glass block it slows down., The ray of light entering the glass block bends towards the normal., When light travelling through glass exits the block, it speeds up., As the light leaves the glass block it bends away from the normal.,

Refraction (SciPAD pages 100-101)

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