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==Key Stage 3==
===Meaning===
[[File:PrismPicture.png|right|300px|thumb|A [[glass]] [[prism]] with a [[Light Ray|ray]] of white [[light]] being split into the colours of the [[spectrum]].]]
A [[prism]] is a [[transparent]] [[solid]] block with a triangular base.
===About Prisms===
: [[Prism]]sshow how white [[light]] is made of many different colours.When white [[light]] enters a [[prism]] it is split into a [[spectrum]] of 7 colours:*Red*Orange*Yellow*Green*Blue*Indigo*Violet {| class="wikitable"|-|[[File:PrismDiagram.png|center|500px]]|-| style="height:20px; width:200px; text-align:center;" |A diagram of a [[prism]] showing how white [[light]] is made of the 7 colours of the spectrum.|}