Jobs & Education5 mins ago
Prism
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I have looked everywhere for a glass prism like on the front of Dark Side of the Moon, I can find small ones which are acrylic but not the pyramid shape, but endless searches seem to draw a blank on a large glass one.
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For more on marking an answer as the "Best Answer", please visit our FAQ.How big is big, I can find glass ones up to about 35mm on a side although 25mm seems more usual, a few here http://www.djb.co.uk/SidePages/PhysicsPages/li ght.html