Newtonian telescope

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Definition

Noun: A Newtonian telescope is a type of reflecting telescope. Its defining design feature is that the image is viewed through an eyepiece that is positioned perpendicular to the telescope's main optical axis. This is achieved using a flat secondary mirror to redirect the light path to the side of the tube.

Usage

This term is used specifically in the context of astronomy and optical instrument design to describe this particular telescope configuration invented by Sir Isaac Newton. * The Newtonian telescope is popular among amateur astronomers for its simplicity and effectiveness. * Compared to other designs, a Newtonian telescope often offers more aperture for the cost.

Advanced Usage
  • The design is often contrasted with the Cassegrain telescope or refracting telescope.
  • The term can be used attributively (like an adjective) in phrases such as Newtonian telescope design or Newtonian telescope optics.
Variants and Related Words
  • Newtonian (adj/n): Pertaining to Sir Isaac Newton or his theories. In optics, it can be a shorthand for "Newtonian telescope" (e.g., "a 6-inch Newtonian").
  • Reflector (n): A general term for any telescope that uses mirrors to gather light, which includes the Newtonian design.
  • Reflecting telescope (n): The broader category of telescopes to which the Newtonian design belongs.
Synonyms
  • Newtonian reflector
Related Phrases
  • Primary mirror: The main light-gathering mirror in a Newtonian telescope.
  • Secondary mirror: The flat diagonal mirror that directs light to the eyepiece.
  • Eyepiece holder: The assembly on the side of the tube where the eyepiece is inserted.
Noun
  1. reflecting telescope in which the image is viewed through an eyepiece perpendicular to main axis

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