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  2. Convex and Concave - Wikipedia

    en.wikipedia.org/wiki/Convex_and_Concave

    Convex and Concave is a lithograph print by the Dutch artist M. C. Escher, first printed in March 1955. [1] It depicts an ornate architectural structure with many ...

  3. Curved mirror - Wikipedia

    en.wikipedia.org/wiki/Curved_mirror

    A concave mirror, or converging mirror, has a reflecting surface that is recessed inward (away from the incident light). Concave mirrors reflect light inward to one focal point. They are used to focus light. Unlike convex mirrors, concave mirrors show different image types depending on the distance between the object and the mirror.

  4. Concave function - Wikipedia

    en.wikipedia.org/wiki/Concave_function

    A function f is concave over a convex set if and only if the function −f is a convex function over the set. The sum of two concave functions is itself concave and so is the pointwise minimum of two concave functions, i.e. the set of concave functions on a given domain form a semifield.

  5. Fluting (architecture) - Wikipedia

    en.wikipedia.org/wiki/Fluting_(architecture)

    Alternating convex and concave flutes on the two nearest piers. In Byzantine architecture columns were mostly relatively small and functional rather than decorative. They were used to support galleries, ciboriums over altars and the like. Byzantine taste appreciated rare and expensive types of stone, and like to see these in round and polished ...

  6. Real image - Wikipedia

    en.wikipedia.org/wiki/Real_image

    Real images can be produced by concave mirrors and converging lenses, only if the object is placed further away from the mirror/lens than the focal point, and this real image is inverted. As the object approaches the focal point the image approaches infinity, and when the object passes the focal point the image becomes virtual and is not ...

  7. Distorting mirror - Wikipedia

    en.wikipedia.org/wiki/Distorting_mirror

    Boy's image in a distorting mirror. A distorting mirror, funhouse mirror or carnival mirror is a popular attraction at carnivals and fairs. [1] Instead of a normal plane mirror that reflects a perfect mirror image, distorting mirrors are curved mirrors, often using convex and concave sections to achieve the distorted effect. [2]

  8. Catoptrics - Wikipedia

    en.wikipedia.org/wiki/Catoptrics

    The book covers the mathematical theory of mirrors, particularly the images formed by plane and spherical concave mirrors. Hero's Catoptrics. Written by Hero of Alexandria, this work concerns the practical application of mirrors for visual effects. In the Middle Ages, this work was falsely ascribed to Ptolemy. It only survives in a Latin ...

  9. Wikipedia : Picture peer review/Concave and Convex mirrors

    en.wikipedia.org/.../Concave_and_Convex_mirrors

    A concave mirror A convex mirror A convex mirror - SVG version. Reasons of nomination: According to the standards page, the images are: Of High Quality; Have a free license; Add value to an article; Accurate; With good captions; According to the same standards, the images might be: Wikipedia's best work; pleasing to the eye