We also did an experiment in 3rd grade where we used a prism to take white light and separate it into the seven colors of the rainbow. The website is correct.
http://en.wikipedia.org/wiki/Prism_%28optics%29
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Isaac Newton first thought that prisms split colours out of colourless light. Newton placed a second prism such that a separated colour would pass through it and found the colour unchanged. He concluded that prisms separate colours. He also used a lens and a second prism to recompose the rainbow into white light.
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