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Collimating lensA collimating lens is a lens used to gather together a parallel beam of light.In the original spectroscope design in the early 19th century, light entered a slit and a collimating lens transformed the light into a thin beam of parallel rays. A prism then refracted the beam into its spectrum. 
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Collimating lens".