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refractor
subjectfact 
refractorhas lens maker the person, company or institution that created the lenshas source: Talbot, J. 2001, 2001-09-27 09:27:44.0
has lens type doublet2001-09-27 09:27:44.0
has optical design visual refractor2001-09-27 09:27:44.0
has definition A telescope in which the light is focused by a lens at the viewing side of the telescope. By contrast, a reflecting telescope is one in which light is focused by a mirror.has source: Lightman, A., Brawer, R. 1990 The Lives and Worlds of Modern Cosmologists, Harvard University Press, 2001-09-27 09:27:44.0
has definition Telescope that uses lenses to magnify and focus an image onto an eyepiece. (refractor)has source: Abbot, D. 1984 Astronomers, Peter Bedrick Books, New York, 2001-09-27 09:27:44.0
has definition A device for gathering and amplifying light by means of a lens.has source: Ferris, T. 1988 Coming of Age in the Milky Way, Morrow, 2001-09-27 09:27:44.0
is a kind of optical telescope2001-09-27 09:27:44.0
optical telescopehas reference astrowebhas URL: http://www.cv.nrao.edu/fits/www/yp_optical.html, 2001-09-27 09:27:43.0
telescopehas wavelength sensitivity2001-09-27 09:27:40.0
has angular resolving power2001-09-27 09:27:40.0
has effective diameter2001-09-27 09:27:40.0
has aperture2001-09-27 09:27:40.0
has focal ratio2001-09-27 09:27:40.0
has operator2001-09-27 09:27:40.0
has purpose observe celestial objects2001-09-27 09:27:40.0
has location2001-09-27 09:27:40.0
artifacthas creator2001-09-27 09:27:27.0
has creation date2001-09-27 09:27:27.0
has owner2001-09-27 09:27:27.0
physical objecthas angular momentum2001-09-27 09:27:27.0
has mass2001-09-27 09:27:27.0
has velocity2001-09-27 09:27:27.0
has momentum2001-09-27 09:27:27.0
has temperature2001-09-27 09:27:27.0
has volume2001-09-27 09:27:27.0
has extent2001-09-27 09:27:27.0
has material2001-09-27 09:27:27.0

Kinds of refractor :

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