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  2. Cheval mirror - Wikipedia

    en.wikipedia.org/wiki/Cheval_mirror

    The size of individual mirrors was still small: the 17 seemingly large window-like panes in the Hall of Mirrors are in fact stitched from 357 small pieces of mirror glass. [12] In 1687, Bernard Perrot [ fr ] developed a process of glass casting that enabled first truly large glass mirrors, impossible to make using the traditional glass blowing ...

  3. Primary mirror - Wikipedia

    en.wikipedia.org/wiki/Primary_mirror

    The largest optical telescope in the world as of 2009 to use a non-segmented single-mirror as its primary mirror is the 8.2 m (27 ft) Subaru telescope of the National Astronomical Observatory of Japan, located in Mauna Kea Observatory on Hawaii since 1997; [3] [better source needed] however, this is not the largest diameter single mirror in a telescope, the U.S./German/Italian Large Binocular ...

  4. File:Comparison optical telescope primary mirrors.svg

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

    Dotted lines show sizes of round mirrors that would have had equivalent light-gathering ability. The telescopes shown on this comparison chart are listed below, ordered in each sub-section by (effective) mirror/lens area, low to high, and then by actual/planned first light date, old to new. The "present-day" status is given as of the beginning ...

  5. Mirror - Wikipedia

    en.wikipedia.org/wiki/Mirror

    A mirror reflecting the image of a vase A first-surface mirror coated with aluminium and enhanced with dielectric coatings. The angle of the incident light (represented by both the light in the mirror and the shadow behind it) exactly matches the angle of reflection (the reflected light shining on the table). 4.5-metre (15 ft)-tall acoustic mirror near Kilnsea Grange, East Yorkshire, UK, from ...

  6. The real reason there aren't many mirrors in Disney World ...

    www.aol.com/article/lifestyle/2019/03/29/the...

    Instead of having mirrors over the sink, many Disney guests have noticed instead there’s a full-length mirror by the door so people can check their appearance on their way out.

  7. Optical Telescope Element - Wikipedia

    en.wikipedia.org/wiki/Optical_Telescope_Element

    The mirror assembly from the front with primary mirrors attached, November 2016 The secondary mirror being cleaned with carbon dioxide snow. Optical Telescope Element (OTE) is a sub-section of the James Webb Space Telescope, a large infrared space telescope launched on 25 December 2021, [1] consisting of its main mirror, secondary mirrors, the framework and controls to support the mirrors, and ...

  8. Focal length - Wikipedia

    en.wikipedia.org/wiki/Focal_length

    The focal point F and focal length f of a positive (convex) lens, a negative (concave) lens, a concave mirror, and a convex mirror.. The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power.

  9. Segmented mirror - Wikipedia

    en.wikipedia.org/wiki/Segmented_mirror

    [3] [4] Using a monolithic mirror much larger than 5 meters is prohibitively expensive due to the cost of both the mirror, and the massive structure needed to support it. A mirror beyond that size would also sag slightly under its own weight as the telescope was rotated to different positions, [5] [6] changing the precision shape of the surface ...