plural of X-ray telescope

A telescope which produces a magnified image by reflecting light through a series of mirrors housed in a tube, using a large curved mirror to gather the light and one or more additional mirrors to transmit the light to an eyepiece.

A telescope which produces a magnified image by refracting light through a series of lenses housed in a tube, with a light-gathering objective lens at one end and an eyepiece at the other.

(astronomy) A telescope designed to make observations of the sun.

(astronomy) A device for observing astronomical sources of radio waves, normally having one or more large parabolic dishes.

(astronomy) A telescope, having a wide field of view, comprising a thin aspheric lens and a large concave mirror

An achromatic telescope in which the coloured dispersion produced by a single object lens of crown glass is corrected by a smaller concave lens, or combination of lenses, of high dispersive power, placed at a distance in the narrower part of the converging cone of rays, usually near the middle of the tube.

(astronomy) a star that is fainter than 7th magnitude in apparent magnitude, and therefore in most cases is not visible to the naked eye.

A telescope which, unlike most telescopes used for astronomical purposes, contains an arrangement of lenses presenting an erect (non-inverted) image to the observer, suitable for observation of objects on the Earth's surface.

(astronomy) An alt-azimuth mounted Newtonian reflector (Newtonian telescope); a type of reflecting telescope (reflector).