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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. Calculus of variations - Wikipedia

    en.wikipedia.org/wiki/Calculus_of_Variations

    Snell's law for refraction requires that these terms be equal. As this calculation demonstrates, Snell's law is equivalent to vanishing of the first variation of the optical path length. As this calculation demonstrates, Snell's law is equivalent to vanishing of the first variation of the optical path length.

  4. Numerical aperture - Wikipedia

    en.wikipedia.org/wiki/Numerical_aperture

    Due to Snell's law, the numerical aperture remains the same: NA = n 1 sin θ 1 = n 2 sin θ 2. In optics, the numerical aperture (NA) of an optical system is a dimensionless number that characterizes the range of angles over which the system can accept or emit light.

  5. Snell's window - Wikipedia

    en.wikipedia.org/wiki/Snell's_window

    Snell's window (also called Snell's circle [1] or optical man-hole [2]) is a phenomenon by which an underwater viewer sees everything above the surface through a cone of light of width of about 96 degrees. [3] This phenomenon is caused by refraction of light entering water, and is governed by Snell's Law. [4]

  6. List of scientific laws named after people - Wikipedia

    en.wikipedia.org/wiki/List_of_scientific_laws...

    Sérsic's law: Astrophysics: José Luis Sérsic: Snell's law: Optics: Willebrord van Roijen Snell: Sokolov–Ternov effect: Particle Physics: Arsenij Sokolov and Igor Ternov: Sommerfeld–Kossel displacement law: Spectroscopy: Arnold Sommerfeld and Walther Kossel: Spearman's law of diminishing returns: Psychology Charles Spearman: Stefan ...

  7. Holiday mocktails for anyone going dry during Christmas or ...

    www.aol.com/holiday-mocktails-anyone-going-dry...

    French '89 Ingredients 1 oz non-alcoholic gin 1/4 oz simple syrup 1/4 oz lemon juice 3 oz non-alcoholic sparkling wine (chilled in advance) Lemon peel for garnish Method: Add all ingredients to glass.

  8. The best gifts for all kinds of dads in 2024 - AOL

    www.aol.com/lifestyle/best-gifts-dads-195639570.html

    Dads tend to have the most fun hobbies — fishing, golfing, bird watching, and, if you're my father-in-law, storytelling. He tends to be an incredibly fun person to shop for this time of year ...

  9. Thin lens - Wikipedia

    en.wikipedia.org/wiki/Thin_lens

    Refraction of a thin planoconvex lens. Consider a thin lens with a first surface of radius and a flat rear surface, made of material with index of refraction .. Applying Snell's law, light entering the first surface is refracted according to ⁡ = ⁡, where is the angle of incidence on the interface and is the angle of refraction.