Evidence suggests ancient civilizations, including the Greeks, may have had early optical knowledge and devices like ...
Instead of a concave lens near the eye ... This was the first working reflecting telescope. Other designers proved unable to grind mirrors with a regular curvature, so the reflector remained ...
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A rare look at NASA’s next sharp-eyed space telescopeThe central feature of the telescope is an exquisitely polished, concave primary mirror, 2.4 meters (7.9 feet) in diameter. The primary mirror sits beneath a smaller, secondary mirror that, connected ...
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