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The Swedish 1-m Solar Telescope, with a lens diameter of 43 inches, is technically the largest, with 39 inches clear for the aperture.The second largest refracting telescope in the world is the Yerkes Observatory 40 inch (102 cm) refractor, used for astronomical and scientific observation for over a century.
A Coddington magnifier is a magnifying glass consisting of a single very thick lens with a central deep groove diaphragm at the equator, thus limiting the rays to those close to the axis, which minimizes spherical aberration. This allows for greater magnification than a conventional magnifying glass, typically 10× up to 20×. Most single lens ...
The fabrication of the two-element achromatic objective lens, the largest lens ever made at the time, caused years of delay. [2] The famous large telescope maker Alvan Clark, was in charge of the optical design. He gave the contract for casting the high quality optical glass blanks, of a size never before attempted, to the firm of Charles Feil ...
glass mirror reflector: World's largest 1976: Zelenchukskaya, Caucasus: 1976 McMath-Pierce Solar Telescope: 1.61 m: 63" glass mirror reflector: Largest solar telescope: Kitt Peak National Obs., USA: 1962 Hale Telescope (200 inch) 5.08 m: 200" glass mirror reflector: World's largest 1948: Palomar Observatory, California, USA: 1948 Samuel Oschin ...
Stanhope lens with case, early 1800s. A Stanhope lens is a simple, one-piece microscope invented by Charles, the third Earl of Stanhope.It is a cylinder of glass with each end curved outwards, one being more convex than the other.
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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