Newtonian telescope
noun
: a reflecting telescope including a spherical or paraboloidal primary mirror and a flat reflecting surface (as of a mirror or prism) set at 45 degrees to the optical axis to reflect the light to a focus at the side of the telescope tube
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“Newtonian telescope.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Newtonian%20telescope. Accessed 28 Nov. 2024.
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