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beam splitter

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noun Optics, Photography.
  1. 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.
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Origin of beam splitter

First recorded in 1930–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for beam splitter

beam splitter

noun
  1. a system that divides a beam of light, electrons, etc, into two or more paths
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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