penta prism

[pen-tuh-priz-uhm]

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noun

a prism that has five faces, a pair of which are at 90° to each other; a ray entering one of the pair emerges from the other at an angle of 90° to its original direction: used especially in single-lens reflex cameras to reverse images laterally and reflect them to the viewfinder.

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Also, penta prism.

Origin:
1935–40; penta- + prism

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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