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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 developed a process of glass casting that enabled first truly large glass mirrors, impossible to make using the traditional glass blowing process.

  3. 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 ...

  4. Catadioptric system - Wikipedia

    en.wikipedia.org/wiki/Catadioptric_system

    This means the lens's F-number value is fixed to the overall designed focal ratio of the optical system (the diameter of the primary mirror divided into the focal length). The inability to stop down the lens results in the catadioptric lens having a short depth of field.

  5. Hale Telescope - Wikipedia

    en.wikipedia.org/wiki/Hale_Telescope

    The Hale's 200 in (510 cm) mirror was near the technological limit of a primary mirror made of a single rigid piece of glass. [ 22 ] [ 23 ] Using a monolithic mirror much larger than the 5-meter Hale or 6-meter BTA-6 is prohibitively expensive due to the cost of both the mirror, and the massive structure needed to support it.

  6. 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 ...

  7. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    11 cm = 1.1 dm – length of an average potato in the US; 13 cm = 1.3 dm – body length of a Goliath birdeater; 15 cm = 1.5 dm – approximate size of largest beetle species; 19 cm = 1.9 dm – length of a banana; 26.3 cm = 2.6 dm – length of average male human foot; 29.98 cm = 2.998 dm – distance light in vacuum travels in one nanosecond

  8. 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 ...

  9. Liquid-mirror telescope - Wikipedia

    en.wikipedia.org/wiki/Liquid-mirror_telescope

    The mercury mirror of the Large Zenith Telescope in Canada was the largest liquid-metal mirror ever built. It had a diameter of 6 meters and rotated at a rate of about 8.5 revolutions per minute. It was decommissioned in 2016. [4] This mirror was a test, built for $1 million, but it was not suitable for astronomy because of the test site's weather.

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