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Dove prism

noun, Optics.
1.
a prism that inverts a beam of light, often used in a telescope to produce an erect image.
Also called erecting prism, reversing prism, rotating prism.
Origin
named after Heinrich W. Dove (1803-79), German physicist
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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