Definitions for optical bench
Random House Webster's College Dictionary
an apparatus, as a special table or rigid beam, for the precise positioning of light sources, screens, and optical instruments used for optical and photometric studies.
Origin of optical bench:
apparatus for observation and measurement of optical phenomena
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"optical bench." Definitions.net. STANDS4 LLC, 2013. Web. 26 May 2013. <http://www.definitions.net/definition/optical bench>.