Optical Pathlength

Definition: In broader context, the term refers to the trajectory that the light follows within a medium. Path length is the distance obtained as the product of the propagation velocity and the propagation delay between two points. In the propagation of waves, path length is the length that is proportional to the time a wave or signal takes to travel from one point to another.

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Related terms: Differential Path length factor, Photon Banana  

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