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How did we light before Kino's?


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Keith Walters wrote: "If you use a CD or DVD disc as a 45 degree mirror it will act as a crude diffraction grating allowing you to see a light source broken up into a "rainbow" spectrum".

 

Not that I doubted it would, but this really works! I now have an awesome tool to demonstrate "discontinuous spectrum" to disbelieving students. Thanks.

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