Astronomical telescopes

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Presentation transcript:

Astronomical telescopes How do they work? Use eyepiece to watch image Refractor: Lens collects light Use eyepiece to watch image Reflector: Mirror collects light 2”-5” toy 6”-30” amateur 3’-10’ professional 10’-33’ super Large lens/mirror collects much light - the diameter of the telescope is the important indicator!

Why do we need telescopes? To collect much light - need large diameter To make small objects look large - need magnification 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 little light Notice: all stars twinkle but planets twinkle less - why? Answer: planets are disks in a telescope, but stars are always points much light

Questions coming …

sec 10 9 11 12 15 14 13 8 7 1 2 3 5 4 6 16 26 17 27 28 30 29 24 25 23 19 18 20 21 22 Question 7 Which of the following is the most important measure of a telescope? A The magnification. B The diameter of its mirror (or lens). C The focal length of its mirror (or lens). D The length of the telescope. E The distance of the farthest object it can see. Next question coming …

sec 10 9 11 12 15 14 13 8 7 1 2 3 5 4 6 16 26 17 27 28 30 29 24 25 23 19 18 20 21 22 Question 8 The largest telescope we have at Ole Miss is 15 inches. What category is that? A Large professional. B Average professional. C A decent amateur size. D A small amateur size. E Uselessly small for astronomy. Next question coming …