Difference between revisions 2146410 and 2240148 on enwikiversity

[[Image:Brorfelde Schmidt Telescope.jpg|thumb|right|250px|The Schmidt Telescope at the former Brorfelde Observatory is now used by amateur astronomers. Credit: [[commons:User:Moeng|Mogens Engelund]].]]
A '''radiation telescope''' is an instrument designed to collect and focus radiation so as to make distant sources appear nearer.
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==Astronomy==
{{main|Keynote lectures/Astronomy}}
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==Mirrors==
{{main|Radiation astronomy/Telescopes/Mirrors|Mirrors}}
[[Image:Wolter-types.gif|thumb|right|250px|This is a diagram of Wolter telescopes of Types I, II, and III. Credit: .]]
The mirrors can be made of ceramic or metal foil.<ref name=xraysMirror>{{ cite book
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|title=Mirror Laboratory  ⏎
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|url=http://astrophysics.gsfc.nasa.gov/xrays/MirrorLab/xoptics.html  ⏎
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}}</ref> The most commonly used grazing angle incidence materials for X-ray mirrors are [[w:gold|gold]] and [[w:iridium|iridium]]. The critical reflection angle is energy dependent. For gold at 1&nbsp;keV, the critical reflection angle is 3.72&nbsp;degrees. A limit for this technology in the early 2000s with Chandra and XMM-Newton was about 15 keV light.<ref name=nustar1>[http://www.nustar.caltech.edu/about-nustar/instrumentation/optics NuStar: Instrumentation: Optics]</ref> Using (contracted; show full){{tlx|Radiation astronomy resources}}{{Principles of radiation astronomy}}{{tlx|Technology resources}}{{Sisterlinks|Radiation telescopes}}
{{Sisterlinks|Telescopes}}

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[[Category:Instruments/Lectures]]
[[Category:Materials sciences/Lectures]]
[[Category:Radiation astronomy/Lectures]]
[[Category:Technology/Lectures]]