62.0 MB (1.3 MB compressed)
5255 x 4126 pixels
44.5 x 35.1 cm ⏐ 17.5 x 13.8 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Sir Isaac Newton's own drawing of his reflecting telescope. Newton designed and built the first reflecting telescope in 1668. The telescope worked by focusing light by reflection from a parabolic mirror, instead of by refraction through a lens. The design avoided the chromatic aberration and loss of light caused by the use of lenses and was highly successful; the largest modern telescopes are all of the reflecting variety. Newton's first telescope was only 15 cm long & 2.5 cm in diameter but could magnify 30-40 times. He built a second larger version, probably the one shown here, in 1671.
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