Lecture06.doc - Telescopes(continued) Telescopesarelimitedby

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Telescopes (continued) Telescopes are limited by  Sensitivity  (determined by the size of the collecting device and the sensitivity  of the detector) Resolution (determined by the size of the telescope and       especially in the case of optical telescopes) by turbulence       in the Earth’s atmosphere. Field-of-view (determined by the telescope geometry). Optical Telescopes - Refracting Telescopes - have objective lenses Chromatic Aberration Maximum diameter - about 40 inches - supported only at rim Reflecting Telescopes - have objective mirrors No chromatic aberration  Supported along entire back - Maximum diameter - Currently 10 m - about 400 inches – but designing 20-30m Optical telescopes consist of  Mirror (primary photon collecting device) One or more additional mirrors or lenses (to bring the light to a focus  at a convenient location). The  resolution  of a telescope is the angle into which a point of light is spread by a  telescope.  We may think of it as the smallest angular separation between two point-like  objects that can be discerned (or resolved) by a telescope.  If there were no atmosphere,  the size of a resolution element is determined by  λ /D where  λ is the wavelength of light being observed and D is the diameter of the primary 
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This note was uploaded on 03/02/2011 for the course ASTRO 10 taught by Professor Norm during the Spring '06 term at Berkeley.

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Lecture06.doc - Telescopes(continued) Telescopesarelimitedby

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