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Post:	138

17 Jan 2012 10:01:15 IST

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telescope

Physics

An astronmical telescope has an objective of focal length 200 cm and an eyepiece of focal length 10 cm . An observer ajusts the distance of the eyepiece from the objective to obtain the image of the sun on a screen 40 cm behind the eyepiece. The diameter of the sun?s image is 6.0 cm .Find the diameter of the sun. The average earth-sun distance is 1.5x 1011 m.??

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