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  2. Dioptrique - Wikipedia

    en.wikipedia.org/wiki/Dioptrique

    Descartes' third model creates a mathematical equation for the Law of Refraction, characterized by the angle of incidence equalling the angle of refraction. In today's notation, the law of refraction states, sin i = n sin r, where i is the angle of incidence, r is the angle of refraction, and n is the index of refraction. Using a tennis ball ...

  3. File:The refraction of the eye, a manual for students (IA ...

    en.wikipedia.org/wiki/File:The_refraction_of_the...

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  4. File:The refraction of the eye - a manual for students (IA ...

    en.wikipedia.org/wiki/File:The_refraction_of_the...

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  5. Angle of incidence (optics) - Wikipedia

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

    The angle of reflection and angle of refraction are other angles related to beams. In computer graphics and geography, the angle of incidence is also known as the illumination angle of a surface with a light source, such as the Earth's surface and the Sun. [1]

  6. 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.

  7. File:Refraction of the eye - its diagnosis and the correction ...

    en.wikipedia.org/wiki/File:Refraction_of_the_eye...

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  8. Opticks - Wikipedia

    en.wikipedia.org/wiki/Opticks

    Book III to the 1730 edition of Opticks containing queries 1 to 4. Newton originally considered to write four books, but he dropped the last book on action at a distance. [5] Instead he concluded Opticks a set of unanswered questions and positive assertions referred as queries in Book III. The first set of queries were brief, but the later ones ...

  9. Refractive index - Wikipedia

    en.wikipedia.org/wiki/Refractive_index

    The second prism should have an index of refraction higher than that of the liquid, so that light only enters the prism at angles smaller than the critical angle for total reflection. This angle can then be measured either by looking through a telescope , [ clarification needed ] or with a digital photodetector placed in the focal plane of a lens.