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  2. 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.

  3. In re Himmel - Wikipedia

    en.wikipedia.org/wiki/In_re_Himmel

    Months earlier, in a case cited in this decision, In re Anglin, 122 Ill.2d 531, 525 N.E.2d 550 (May 18, 1988), the Illinois Supreme Court refused to reinstate the law license of an attorney convicted of (among other felonies) possessing stolen securities, and who wished to be reinstated while continuing to withhold the name of the person or ...

  4. Seismic refraction - Wikipedia

    en.wikipedia.org/wiki/Seismic_refraction

    Seismic refraction is a geophysical principle governed by Snell's Law of refraction. The seismic refraction method utilizes the refraction of seismic waves by rock or soil layers to characterize the subsurface geologic conditions and geologic structure .

  5. Fermat's principle - Wikipedia

    en.wikipedia.org/wiki/Fermat's_principle

    If we seek the required value of x, we find that the angles α and β satisfy Snell's law. Fermat's principle, also known as the principle of least time, is the link between ray optics and wave optics. Fermat's principle states that the path taken by a ray between two given points is the path that can be traveled in the least time.

  6. Appeals court keep Illinois' gun ban in place as case proceeds

    www.aol.com/appeals-court-keep-illinois-gun...

    (The Center Square) – Illinois’ gun and magazine ban will stay in effect pending the outcome in the Seventh Circuit U.S. Court of Appeals, the appeals court ruled Thursday. Illinois banned the ...

  7. Illinois Scavenger Sale Law failed to end effects of ... - AOL

    www.aol.com/illinois-scavenger-sale-law-failed...

    A nearly 80-year-old law intended to put distressed and tax-delinquent Chicago-area properties back to productive use has done little to The post Illinois Scavenger Sale Law failed to end effects ...

  8. Ibn Sahl (mathematician) - Wikipedia

    en.wikipedia.org/wiki/Ibn_Sahl_(mathematician)

    Ibn Sahl dealt with the optical properties of curved mirrors and lenses and has been described as the discoverer of the law of refraction (Snell's law). [ 9 ] [ 10 ] [ 11 ] Ibn Sahl uses this law to derive lens shapes that focus light with no geometric aberrations, known as anaclastic lenses .

  9. Total external reflection - Wikipedia

    en.wikipedia.org/wiki/Total_external_reflection

    Total internal reflection describes the fact that radiation (e.g. visible light) can, at certain angles, be totally reflected from an interface between two media of different indices of refraction (see Snell's law). Total internal reflection occurs when the first medium has a larger refractive index than the second medium, for example, light ...