Optics and Telescopes
Guiding Questions
Telescopes
A refracting telescope uses a lens to concentrate incoming light at a focus
How Light Beams Behave
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Magnification
Light Gathering Power
Chromatic Aberration
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A reflecting telescope uses a mirror to concentrate incoming light at a focus
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Reflecting Telescopes
Gemini North Telescope
Spherical Aberration
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Telescope images are degraded by the blurring effects of the atmosphere and by light pollution
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An electronic device is commonly used to record the image at a telescope’s focus
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Spectrographs record the spectra of astronomical objects
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A radio telescope uses a large concave dish to reflect radio waves to a focus
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Optical and Radio Views of Saturn
Telescopes in orbit around the Earth detect radiation that does not penetrate the atmosphere
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Satellite-based observatories provide new information about the universe and permit coordinated observation of the sky at all wavelengths
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Key Words
Author: Michael Cohen
E-mail: mrcohe@ship.edu
Homepage: http://physics.ship.edu/~mrc/