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  2. 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.

  3. Optical telescope - Wikipedia

    en.wikipedia.org/wiki/Optical_telescope

    The Large Binocular Telescope at the Mount Graham International Observatory in Arizona uses two curved mirrors to gather light. An optical telescope gathers and focuses light mainly from the visible part of the electromagnetic spectrum, to create a magnified image for direct visual inspection, to make a photograph, or to collect data through electronic image sensors.

  4. List of largest optical reflecting telescopes - Wikipedia

    en.wikipedia.org/wiki/List_of_largest_optical...

    There are only a few sites capable of polishing the mirrors for these telescopes. SAGEM in France polished the four VLT mirrors, the two Gemini mirrors, and the 36 segments for GTC. [18] The Steward Observatory Mirror Lab cast and polished the two LBT mirrors, the two Magellan mirrors, the MMT replacement mirror, and the LSST primary/tertiary ...

  5. A magnifying mirror is a travel must-have for anyone over the ...

    www.aol.com/lifestyle/a-magnifying-mirror-is-a...

    The Kintion Pocket Mirror provides a portable, two-sided compact (with each mirror side measuring a generous 3.3 by 2.5 inches) that is ideal for slipping into your purse or weekender. One side ...

  6. Large Zenith Telescope - Wikipedia

    en.wikipedia.org/wiki/Large_Zenith_Telescope

    The Large Zenith Telescope (LZT) was a 6.0-meter diameter liquid-mirror telescope located in the University of British Columbia's Malcolm Knapp Research Forest, about 70 km (43 mi) east from Vancouver, British Columbia, Canada (north from Maple Ridge).

  7. Zograscope - Wikipedia

    en.wikipedia.org/wiki/Zograscope

    According to Michael Quinion, the origin of the term is lost, but it is also known as a diagonal mirror, as an optical pillar machine, or as an optical diagonal machine. [ 2 ] In Japan, the zograscope became known as 和蘭眼鏡 ( Oranda megane , 'Dutch glasses') or 覗き眼鏡 ( nozoki megane 'peeping glasses'), and the pictures were known ...

  8. Cassegrain reflector - Wikipedia

    en.wikipedia.org/wiki/Cassegrain_reflector

    Light path in a Cassegrain reflecting telescope. The Cassegrain reflector is a combination of a primary concave mirror and a secondary convex mirror, often used in optical telescopes and radio antennas, the main characteristic being that the optical path folds back onto itself, relative to the optical system's primary mirror entrance aperture.

  9. Magnification - Wikipedia

    en.wikipedia.org/wiki/Magnification

    Stepwise magnification by 6% per frame into a 39-megapixel image. In the final frame, at about 170x, an image of a bystander is seen reflected in the man's cornea. Magnification is the process of enlarging the apparent size, not physical size, of something. This enlargement is quantified by a size ratio called optical magnification.

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