light, optics and telescopes
DESCRIPTION
Light, Optics and Telescopes . The Electromagnetic Spectrum. Photons of different energies radiate at different wavelengths or frequencies. wavelength x frequency = velocity of light ( c) . l n = c . c = 5 x 10 5 km/s . c = 186,000 miles/s . - PowerPoint PPT PresentationTRANSCRIPT
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Light, Optics and Telescopes
The Electromagnetic Spectrum
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Photons of different energies radiate at different wavelengths or frequencies
wavelength x frequency = velocity of light ( c)
= c
c = 5 x 105 km/s
c = 186,000 miles/s
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Atmospheric Windows
Visible and radio
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Physical Properties of Light
Refraction
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Reflection
Refraction is wavelength dependent
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Formation of an image
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Telescopes -- Refractors
Yerkes Observatory – Lake Geneva, Williams Bay Wisconsin
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20th Century Large Reflectors
Mt Wilson 100-inch – 100 yrs old
Cerro Tololo 4 -meter
Palomar 200-inch
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Modern Observatories
Cerro Tololo Interamerican Obs.
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Kitt Peak National Obs.
Tucson Arizona
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Very Large Telescopes Mauna Kea
ESO – VLT
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MMT on Mt. Hopkins, AZ
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Minnesota’s $5M (private) investment in a very large telescope (> $100M)
Large Binocular Telescope (LBT) Mt. Graham Arizona
Design
Other partners -- University of Arizona, Germany, Italy, Ohio State University, University of Virginia, Notre Dame
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Radio Telescopes
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Arecibo
Very Large Array – VLA
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Telescopes in Space -- other wavelengths – UV, X ray, gamma ray and far-IR