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beam splitter

noun, Optics, Photography
a mirror or prism that divides a beam of light into two parts by reflecting a part of the beam, used in camera range finders.
Origin of beam splitter
1930-35 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for beam splitter

beam splitter

a system that divides a beam of light, electrons, etc, into two or more paths
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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