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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.
FIRST APPLY LENS FORMULA AT OBJECTIVE AND THEN AT EYE PIECE.
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