Telescopes - PowerPoint PPT Presentation

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Telescopes

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Aperture refers to the diameter of the primary lens or mirror of telescope ... The only reason to put a visible light telescope in space is to improve resolution! ... – PowerPoint PPT presentation

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Title: Telescopes


1
Telescopes
  • Collect more light than eye
  • More detailed images than human eye
  • Larger aperture is better
  • Aperture refers to the diameter of the primary
    lens or mirror of telescope
  • Magnification is useless withoutsensitivity and
    resolution are crucial

2
Refractor Telescope
3
Reflector Telescope
4
Reflectors
5
Sensitivity
  • Compound Mirror

6
Diffraction Pattern
7
Angular Resolution
  • Larger aperture (diameter) telescopes have
    smaller diffraction patterns
  • The smaller the diffraction patterns result in
    better angular resolution (more detail)
  • Diffraction limit in arcseconds
    2.5 105 (l/D) l wavelength D aperture
  • Smallest detail that can be resolved

8
Bigger is Better
  • Better sensitivity more light gathering area
  • Better angular resolution in most instances
    more detail
  • Figure shows effect of larger aperture

9
Seeing Atmospheric Effect
10
Why Put a Telescope in Orbit?
  • The only reason to put a visible light telescope
    in space is to improve resolution!
  • a) ground-based b) damaged Hubblec) enhanced
    image d) repaired Hubble

11
Atmospheric Windows
  • Certain wavelengths require orbiting telescopes
  • Radio and visible light can be done from ground

12
Mauna Kea
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