Unformatted text preview: o Uses a mirror to bring light to a focus o Suffer from spherical aberration – if curve is not the right angle o Paraboloid or hyperboloid allow for a single focus • Radio Telescope o Much bigger areas needed • Telescopes in Space o Advantages: No distortion by atmosphere Darker sky (especially for infrared) You can’t get all of the different kinds of light from the ground • Uv/x-ray/gamma ray/infrared/ O-Zone, water vapor, and other molecules are bypassed • Twinkiling of Stars o Air bends starlight Due to atmospheric turbulence, the bending varies with time, so the amount of light hitting your eye varies. o Star closer to horizon – more air, more turbulence – more twinkling. o This is related to blurring of a star’s image: it doesn’t like point-like. o Planets don’t usually twinkle, stars do • Adaptive Optics o Changes the light waves to flat when they are actually jumping around...
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- Fall '08
- Light, blur Refracting Telescopes, small refracting telescopes, Typical large telescope