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Home > Terms > English, UK (UE) > Optical pathlength
Optical pathlength
(Sometimes called optical path or optical length. ) The line integral of the refractive index (real part) along a ray connecting two points in an optically homogeneous medium. Because refractive index depends on frequency, so does optical pathlength. Although optical pathlength may be shortened to optical path, there is a difference between a path and its length. Compare optical thickness.
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