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Or when you look for a clip art of a prism
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[QUOTE="Vanadium 50, post: 6816324, member: 110252"] Used them - well, actually senses, but the same idea - in a freshman physics lab I taught. They are air filled, and you make the measurements in a water tank. Concave is focusing. [/QUOTE]
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Or when you look for a clip art of a prism
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