astronomy - Astronomical telescopes How do they work Use...

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How do they work? Refractor: Lens collects light Reflector: Mirror collects light Use eyepiece to watch image Large lens/mirror collects much light - the diameter of the telescope is the important indicator! 2”-5” toy 6”-30” amateur 3’-10’ professional 10’-33’ super Astronomical telescopes Use eyepiece to watch image
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To collect much light - need large diameter To make small objects look large - need magnification Magnification = f obj /f eyep Limits to light collection: Diameter > 10 m (=30 feet) will be too heavy to hold Limits to magnification: “Seeing” - stars jump around (related to twinkling) Caused by air turbulence Max you can get: ~1 as, that is ~200x magnification Understand angular measure - visible “size” of object in the sky: 1/2 o is the size of the Sun or the Moon 1 o = 60 am, and 1am (minute of arc) is the resolution of the eye 1 am = 60 as, and 1 as (second of arc) is seeing All stars twinkle but planets don’t.
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