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beam splitter

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WordReference Random House Unabridged Dictionary of American English © 2025

beam′ split′ter, [Optics, Photog.]

Optics, Photographya mirror or prism that divides a beam of light into two parts by reflecting a part of the beam, used in camera range finders.

1930–35

'beam splitter' also found in these entries (note: many are not synonyms or translations):

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