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  2. Refractive index - Wikipedia

    en.wikipedia.org/wiki/Refractive_index

    This is the normal refraction of transparent materials like glass or water, and corresponds to a refractive index which is real and greater than 1. [26] [page needed] If the electrons emit a light wave which is 270° out of phase with the light wave shaking them, it will cause the wave to travel faster.

  3. List of refractive indices - Wikipedia

    en.wikipedia.org/wiki/List_of_refractive_indices

    Refraction at interface. Many materials have a well-characterized refractive index, but these indices often depend strongly upon the frequency of light, causing optical dispersion. Standard refractive index measurements are taken at the "yellow doublet" sodium D line, with a wavelength (λ) of 589 nanometers.

  4. Refraction - Wikipedia

    en.wikipedia.org/wiki/Refraction

    Refraction of light at the interface between two media of different refractive indices, with n 2 > n 1. Since the phase velocity is lower in the second medium ( v 2 < v 1 ), the angle of refraction θ 2 is less than the angle of incidence θ 1 ; that is, the ray in the higher-index medium is closer to the normal.

  5. Dispersion (optics) - Wikipedia

    en.wikipedia.org/wiki/Dispersion_(optics)

    Since that refractive index varies with wavelength, it follows that the angle that the light is refracted by will also vary with wavelength, causing an angular separation of the colors known as angular dispersion. For visible light, refraction indices n of most transparent materials (e.g., air, glasses) decrease with increasing wavelength λ:

  6. Cauchy's equation - Wikipedia

    en.wikipedia.org/wiki/Cauchy's_equation

    The theory of light-matter interaction on which Cauchy based this equation was later found to be incorrect. In particular, the equation is only valid for regions of normal dispersion in the visible wavelength region. In the infrared, the equation becomes inaccurate, and it cannot represent regions of anomalous dispersion. Despite this, its ...

  7. Groom Refuses to Invite Mother Who 'Ignored' Him His Entire ...

    www.aol.com/groom-refuses-invite-mother-ignored...

    After a man's mother remarried when he was a child, he says she "ignored" him and "focused all of her attention" on her new family. Now that the man is getting married, his mother is acting like ...

  8. Austin Butler Looks Unrecognizable After Buzzing Off His ...

    www.aol.com/austin-butler-looks-unrecognizable...

    Austin Butler's looking different with his new hairstyle.. The Bikeriders actor, 33, has been keeping a low profile these days, but according to an Instagram account belonging to excursion company ...

  9. Snell's law - Wikipedia

    en.wikipedia.org/wiki/Snell's_law

    Snell's law (also known as the Snell–Descartes law, the ibn-Sahl law, [1] and the law of refraction) is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air.