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Telescopes

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Reflecting mirror Optical Telescopes Refracting lens Optical Telescopes Reflecting and refracting ... generally can use optical telescope mirrors and lenses. – PowerPoint PPT presentation

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Title: Telescopes


1
Telescopes
2
Optical Telescopes
Images can be formed through reflection (mirror)
or refraction (lens). Reflecting mirror
3
Optical Telescopes
Refracting lens
4
Optical Telescopes
Reflecting and refracting telescopes
5
Optical Telescopes
  • Modern telescopes are all reflectors (use a
    mirror)
  • Light traveling through lens is refracted
    differently depending on wavelength.
  • Some light traveling through lens is absorbed.

6
Optical Telescopes
Image acquisition Charge-coupled devices (CCDs)
are electronic devices, can be quickly read out
and reset.
7
Radio Astronomy
  • Interferometry
  • Combines information from several widely spread
    radio telescopes as if it came from a single dish.

8
Other Astronomies
Infrared radiation can image where visible
radiation is blocked generally can use optical
telescope mirrors and lenses.
9
Other Astronomies
Much can be learned from observing the same
astronomical object at many wavelengths. Here,
the Milky Way.
10
Electromagnetic Spectrum
  • All the types of radiation are shown on the
    electromagnetic spectrum from long wavelengths
    (radio) to short wavelengths (gamma).
  • We can only use our eyes to see a very small
    portion of the radiation that is emitted in the
    universe (visible light)

11
Electromagnetic Spectrum
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