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- Q968571 subject Q4103352.
- Q968571 subject Q7110055.
- Q968571 subject Q7824662.
- Q968571 subject Q7824680.
- Q968571 abstract "A Wolter telescope is a telescope for X-rays using only grazing incidence optics. Visible light telescopes are built with either lenses or parabolic mirrors at nearly normal incidence (that is, a nearly perpendicular angle of reflection). Neither works well for X-rays. Lenses for visible light are made of a transparent material with an index of refraction substantially different from one, but there is no equivalent material for x-rays. Conventional mirror telescopes work poorly in the X-rays as well, since the light hits the mirrors at near-normal incidence, where the X-rays are transmitted or absorbed, not reflected.X-rays mirrors can be built, but only if the angle from the plane of reflection is very low (typically 10 arc-minutes to 2 degrees). These are called glancing (or grazing) incidence mirrors. In 1952, Hans Wolter outlined three ways a telescope could be built using only this kind of mirror. These are called Wolter telescopes of type I, II, and III. Each has different advantages and disadvantages.Wolter's key discovery was that by using two mirrors it is possible to create a telescope with a usably wide field of view. In contrast, a grazing incidence telescope with just one parabolic mirror could focus X-rays, but only very close to the centre of the field of view as it would suffer from extreme coma.".
- Q968571 thumbnail Wolter-types.gif?width=300.
- Q968571 wikiPageExternalLink Wolter_optics.
- Q968571 wikiPageWikiLink Q1115145.
- Q968571 wikiPageWikiLink Q163922.
- Q968571 wikiPageWikiLink Q17091485.
- Q968571 wikiPageWikiLink Q174102.
- Q968571 wikiPageWikiLink Q1772448.
- Q968571 wikiPageWikiLink Q34777.
- Q968571 wikiPageWikiLink Q4103352.
- Q968571 wikiPageWikiLink Q4213.
- Q968571 wikiPageWikiLink Q49002.
- Q968571 wikiPageWikiLink Q54284.
- Q968571 wikiPageWikiLink Q693861.
- Q968571 wikiPageWikiLink Q7110055.
- Q968571 wikiPageWikiLink Q7824662.
- Q968571 wikiPageWikiLink Q7824680.
- Q968571 wikiPageWikiLink Q837488.
- Q968571 wikiPageWikiLink Q97333.
- Q968571 comment "A Wolter telescope is a telescope for X-rays using only grazing incidence optics. Visible light telescopes are built with either lenses or parabolic mirrors at nearly normal incidence (that is, a nearly perpendicular angle of reflection). Neither works well for X-rays. Lenses for visible light are made of a transparent material with an index of refraction substantially different from one, but there is no equivalent material for x-rays.".
- Q968571 label "Wolter telescope".
- Q968571 depiction Wolter-types.gif.