Light, Optics and Telescopes Trip to Lick Observatory

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Optical telescopes and “seeing” • Angular resolution of optical telescopes on Earth is limited ! by changing atmospheric refraction ! not diffraction • The effect that makes stars twinkle blurs telescope images Twinkling… • Stars twinkle because… ! angular size of star is very small % … ! smaller than “bouncing” due to seeing • Angular size of planets is larger… ! they are blurred by seeing…. ! but don’t seem to twinkle % Stars look point-like through a telescope even with very high magnification
Better seeing in space • Best seeing on Earth is a fraction of an arcsecond • Even small telescopes in space are useful Adaptive Optics • Astronomers now try to track atmospheric wobbling... ! with fraction-of-a-second images... ! and artificial guide stars... 2.4m HST
Page 1 and 2: Light, Optics and Telescopes Trip t
Page 3 and 4: Eyes and brain process information
Page 5 and 6: The electromagnetic spectrum •
Page 7 and 8: Wave fronts and light rays • Wave
Page 9 and 10: Cameras and telescopes • Cameras
Page 11 and 12: Reflectors • Use mirror for prima
Page 13 and 14: Telescope mounts: • Alt-Az ! azim
Page 15 and 16: and have better resolving power…
Page 17 and 18: Visual observing: what you care abo
Page 19: Telescope focal length: • Telesco

Light, Optics and Telescopes Trip to Lick Observatory

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