roof prism

noun Optics. Unabridged

Amici prism

noun Optics.
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.

named after G. B. Amici (1784–1863), Italian astronomer Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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