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  2. Archimedes' heat ray - Wikipedia

    en.wikipedia.org/wiki/Archimedes'_heat_ray

    A test of the Archimedes heat ray was carried out in 1973 by the Greek scientist Ioannis Sakkas. The experiment took place at the Skaramagas naval base outside Athens. On this occasion, 70 mirrors were held up by Greek sailors, each with a copper coating and a size of around five by three feet (1.5 by 1 m). The mirrors were pointed at a plywood ...

  3. Eyepiece - Wikipedia

    en.wikipedia.org/wiki/Eyepiece

    An eyepiece, or ocular lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes. It is named because it is usually the lens that is closest to the eye when someone looks through an optical device to observe an object or sample. The objective lens or mirror collects light from an object or ...

  4. 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 ...

  5. Newtonian telescope - Wikipedia

    en.wikipedia.org/wiki/Newtonian_telescope

    Newtonian telescope design. A Newtonian telescope is composed of a primary mirror or objective, usually parabolic in shape, and a smaller flat secondary mirror.The primary mirror makes it possible to collect light from the pointed region of the sky, while the secondary mirror redirects the light out of the optical axis at a right angle so it can be viewed with an eyepiece.

  6. Shop these 9 secret deals only available to Amazon Prime ...

    www.aol.com/lifestyle/shop-these-9-secret-deals...

    A lighted makeup mirror is a handy tool for everything from applying eyeliner to tweezing a stray eyebrow hair. This one is 40% off — but the bargain isn't even the best part.

  7. 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.

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