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Objectives can be a single lens or mirror, or combinations of several optical elements.

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The objective is the optical element that gathers light from the object being observed and focuses the light rays
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Wikipedia
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Text from Wikipedia and Wiktionary web pages quoted for educational purposes is subject to the Wikipedia Creative Commons Attribution ShareAlike Licence
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INFO
Keywords
  • optical astronomy
  • optics
  • objective
  • lens
  • mirror
  • optical telescope
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In optical engineering, the objective is the optical element that gathers light from the object being observed and focuses the light rays to produce a real image.
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Objectives can be a single lens or mirror, or combinations of several optical elements.
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https://en.wikipedia.org/wiki/Objective_(optics)
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In optical engineering, the objective is the optical element that gathers light from the object being observed and focuses the light rays to produce a real image.
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