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optical path

noun
1.
the path of light through a medium, having a magnitude equal to the geometric distance through the system times the index of refraction of the medium.
Origin
1890-1895
1890-95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for optical path
  • Calibration depends on fundamental properties of the hydrogen sulfide molecule and on the optical path length.

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