Prism

[lady_p_gold]

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.

[Fitzer]

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

[lady_p_gold]

Thanks that is better than I found ! I was wanting a large pyramid shape but that is not a bad one, thanks so much. Aren't they hard to find, I usually find things very easily !