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

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

    The non-magnified side has eight small LED lights, ideal for doing your makeup or diffusing the light while using the 3x magnification side. To use the LEDs, just flip a switch in the back and you ...

  3. W. M. Keck Observatory - Wikipedia

    en.wikipedia.org/wiki/W._M._Keck_Observatory

    The W. M. Keck Observatory is an astronomical observatory with two telescopes at an elevation of 4,145 meters (13,600 ft) near the summit of Mauna Kea in the U.S. state of Hawaii. Both telescopes have 10 m (33 ft) aperture primary mirrors, and, when completed in 1993 (Keck I) and 1996 (Keck II), they were the largest optical reflecting ...

  4. 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 is a telescope that 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.

  5. Hale Telescope - Wikipedia

    en.wikipedia.org/wiki/Hale_Telescope

    The Hale Telescope is a 200-inch (5.1 m), f/ 3.3 reflecting telescope at the Palomar Observatory in San Diego County, California, US, named after astronomer George Ellery Hale. With funding from the Rockefeller Foundation in 1928, he orchestrated the planning, design, and construction of the observatory, but with the project ending up taking 20 ...

  6. Ritchey–Chrétien telescope - Wikipedia

    en.wikipedia.org/wiki/Ritchey–Chrétien_telescope

    A Ritchey–Chrétien telescope (RCT or simply RC) is a specialized variant of the Cassegrain telescope that has a hyperbolic primary mirror and a hyperbolic secondary mirror designed to eliminate off-axis optical errors (coma). The RCT has a wider field of view free of optical errors compared to a more traditional reflecting telescope ...

  7. Astroscan - Wikipedia

    en.wikipedia.org/wiki/Astroscan

    The Astroscan had a Newtonian reflector layout with a 4â…›" clear-inch (105mm) diameter f/4.2 aluminized and overcoated borosilicate glass parabolic primary mirror with a focal length of 17½ inches (445mm). [1] The telescope's secondary mirror was mounted on a flat optical window at the front of

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