By: Mark Lavery Robin Alexander. How Does a Telescope Work? Galileos Telescope.

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