optical bench

noun
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, having a ruled bar to which these devices can be attached and along which they can be readily adjusted.

Origin:
1880–85

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World English Dictionary
optical bench
 
n
an apparatus fitted for experimentation in optics, typically consisting of a table and an adjustable arrangement of light source, lenses, prisms, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Therefore, water must be removed from the sample stream before it is allowed to enter the optical bench.
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