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beam splitter

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.


beam splitter

noun

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


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Word History and Origins

Origin of beam splitter1

First recorded in 1930–35

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