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  2. Optical path length - Wikipedia

    en.wikipedia.org/wiki/Optical_path_length

    An electromagnetic wave propagating along a path C has the phase shift over C as if it was propagating a path in a vacuum, length of which, is equal to the optical path length of C. Thus, if a wave is traveling through several different media, then the optical path length of each medium can be added to find the total optical path length. The ...

  3. Optical path - Wikipedia

    en.wikipedia.org/wiki/Optical_path

    Optical path (OP) is the trajectory that a light ray follows as it propagates through an optical medium. The geometrical optical-path length or simply geometrical path length ( GPD ) is the length of a segment in a given OP, i.e., the Euclidean distance integrated along a ray between any two points. [ 1 ]

  4. List of optics equations - Wikipedia

    en.wikipedia.org/wiki/List_of_optics_equations

    Subscripts 1 and 2 refer to initial and final optical media respectively. These ratios are sometimes also used, following simply from other definitions of refractive index, wave phase velocity, and the luminal speed equation:

  5. Gladstone–Dale relation - Wikipedia

    en.wikipedia.org/wiki/Gladstone–Dale_relation

    The Gladstone–Dale term (n − 1) is the non-linear optical path length or time delay. Using Isaac Newton 's theory of light as a stream of particles refracted locally by (electric) forces acting between atoms, the optic path length is due to refraction at constant speed by displacement about each atom.

  6. Refractive index - Wikipedia

    en.wikipedia.org/wiki/Refractive_index

    The colors of a soap bubble are determined by the optical path length through the thin soap film in a phenomenon called thin-film interference. Optical path length (OPL) is the product of the geometric length d of the path light follows through a system, and the index of refraction of the medium through which it propagates, [40] =.

  7. Multipass spectroscopic absorption cells - Wikipedia

    en.wikipedia.org/wiki/Multipass_spectroscopic...

    The path length can be adjusted by changing the incidence angle Φ. Another category of multipass cells is generally referred to as circular multipass reflection cells. They were first introduced by Thoma and co-workers in 1994. [ 7 ]

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  9. Path length - Wikipedia

    en.wikipedia.org/wiki/Path_length

    Distance, the total distance an object travels dependent on its path through space; Optical path length, the product of the distance light travels and the refractive index of the medium it travels through; Mean free path, the average distance that a particle travels before scattering