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Newton's second reflecting telescope

Newton's second reflecting telescope

R102/0094

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51.6 MB (3.3 MB compressed)

4016 x 4490 pixels

34.0 x 38.1 cm ⏐ 13.4 x 15.0 in (300dpi)

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Credit

SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY

Caption

Newton's telescope. Second reflecting telescope designed and built by English astronomer Sir Isaac Newton (1642-1727) in 1671. Newton invented the reflecting telescope in 1668 because he thought that it was impossible to produce a telescope lens that did not produce colour distortions (chromatic aberration). The telescope worked by focusing light using a parabolic mirror. This reflected light back up the 30-centimetre long tube of the telescope to another mirror which reflected it sideways through an eyepiece. This telescope was demonstrated by Newton at a 1672 meeting of the Royal Society, which chose this occasion to elect him into their membership.

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