Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke2761m&link_type=abstract
"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 2761. Bristol: Institute of Physics Publishing, 2001
Astronomy and Astrophysics
Astrophysics
Instrumentation And Observational Techniques, Astronomical Instrumentation
Scientific paper
All the earliest optical telescopes were REFRACTORS, using lenses to form an image; they date back to at least 1608. Since light of different wavelengths is bent or `refracted' unequally as it passes through glass, a refractor always gives a certain amount of false color round an image such as that of a star. Light of whatever color is however reflected in the same direction, so a ...
Moore Patrick
Murdin Paul
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