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roof prism

noun, Optics.

Amici prism

[uh-mee-chee] /əˈmi tʃi/
noun, Optics.
1.
a compound prism that spreads out incident white light into a spectrum but produces no deviation of the central color of the dispersed beam.
Also called direct-vision prism, roof prism.
Origin
named after G. B. Amici (1784-1863), Italian astronomer
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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