Reflecting telescope
A telescope using a concave parabolic mirror to increase focal length and focus light at a point.
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Reflecting Telescope (Reflector) Telescope that uses mirrors to magnify and focus an image onto an eyepiece. Reflection short pass Filter Are interference filters that transmit short-wave light while reflecting long-wave light.
[2] He took up astronomy in 1816, building a reflecting telescope with a mirror 18 inches (460 mm) in diameter and with a 20-foot (6.1 m) focal length. Between 1821 and 1823 he re-examined, with James South, the double stars catalogued by his father.
 See also: Focal length, Focal, Light, Color, Camera
  
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