By: Mark Lavery Robin Alexander. How Does a Telescope Work? Galileos Telescope.
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The Past the Present and the Future of Telescope
TechnologyBy: Mark Lavery
Robin Alexander
How Does a Telescope Work?
History of Telescopes
Galileo’s Telescope
Telescope…a system of lenses, mirrors or both used to gather light from a distant object and form an image.
Telescope…Has three major functions-Gather light-provide resolution-magnification
Introduction….
Galilean- It consists of a convergent lens as objective ( the lens that forms the image); and its eyepiece (or ocular), placed in front of the focus, is a divergent lensKeplerian - eyepiece, or ocular, is a convex (positive, or convergent) lens placed in back of the focus, the point at which the parallel light rays converge; and the instrument produces an inverted (“real”) image that can be projected or made visible.
Types of Telescopes: Refracting
Newtonian- The Newtonian reflecting telescope contained a small plane mirror that was angled at 45 degrees. This was inside the prime focus and brought the light to the side of the telescope.
Cassegrain- Permits short tubes relative to the mirror diameter.
Gregorian- The Gregorian version of the telescope contains a concave secondary mirror outside of the prime focus. This helps to reflect the light back through a hole into a primary mirror.
Types of Telescopes: Reflecting
Largest Refracting Telescope
Telescope Cartoon
Telescope Comparison
Newtonian Keplerian
New Technology Telescopes: What makes them bigger, better, and stronger?
New Technology Telescope La Silla, Chile
Active Optics
New Technology Telescope, Chile, 1989
Hubble Telescope
Hubble Deep Field
Radio Telescopes
Telescopes Working Outside of the Optical Spectrum
Infrared and Ultra-Violet Telescope
Telescopes Working Outside of the Optical Spectrum
X-Ray Telescopes
Telescopes Working Outside of the Optical Spectrum
Transiting Exoplanet Survey
Telescopes of The Future
Telescopes of The Future2020: Giant Magellan Telescope
King, Henry C. The History of the Telescope http://en.wikipedia.org/wiki/Telescope http://en.wikipedia.org/wiki/X-ray_telescope http://www.astro.virginia.edu/class/oconnell/UIT/ http://www.refractortelescopes.co.uk/history.htm http://www.reflectortelescopes.co.uk/guides/a-short-history-of-reflector-
telescopes/http://www.britannica.com/EBchecked/topic/315254/Keplerian-telescopehttp://www.britannica.com/EBchecked/topic/224040/Galilean-telescope
Sources
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