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  2. History of optics - Wikipedia

    en.wikipedia.org/wiki/History_of_optics

    The work is concerned with how curved mirrors and lenses bend and focus light. Ibn Sahl also describes a law of refraction mathematically equivalent to Snell's law. [13] He used his law of refraction to compute the shapes of lenses and mirrors that focus light at a single point on the axis. Alhazen (Ibn al-Haytham), "the father of Optics" [14]

  3. Overhead projector - Wikipedia

    en.wikipedia.org/wiki/Overhead_projector

    Therefore, the transparency is placed face up (toward the mirror and focusing lens), in contrast with a 35mm slide projector or film projector (which lack such a mirror) where the slide's image is non-reversed on the side opposite the focusing lens. A related invention for enlarging transparent images is the solar camera.

  4. Slide projector - Wikipedia

    en.wikipedia.org/wiki/Slide_projector

    Slide projector light generation and collimation system: from left to right, mirror / reflector, bulb, condenser lens 1, green-tinted heat-absorbing glass, condenser lens 2; a centrifugal fan, used to cool the bulb, is visible at the top of the picture.

  5. Stereoscope - Wikipedia

    en.wikipedia.org/wiki/Stereoscope

    A rival of Wheatstone, Brewster credited the invention of the device to a Mr. Elliot, a "Teacher of Mathematics" from Edinburgh, who, according to Brewster, conceived of the idea as early as 1823 and, in 1839, constructed "a simple stereoscope without lenses or mirrors", consisting of a wooden box 18 inches (46 cm) long, 7 inches (18 cm) wide ...

  6. Timeline of telescope technology - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_telescope...

    1611 — Johannes Kepler describes the optics of lenses (see his books Astronomiae Pars Optica and Dioptrice), including a new kind of astronomical telescope with two convex lenses (the 'Keplerian' telescope). 1616 — Niccolo Zucchi claims at this time he experimented with a concave bronze mirror, attempting to make a reflecting telescope.

  7. Spherical aberration - Wikipedia

    en.wikipedia.org/wiki/Spherical_aberration

    In optics, spherical aberration (SA) is a type of aberration found in optical systems that have elements with spherical surfaces.This phenomenon commonly affects lenses and curved mirrors, as these components are often shaped in a spherical manner for ease of manufacturing.

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  9. 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 .