Task id13231
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Task id13231
The lens of the Kepler telescope is a lens with a focal length F1 = 500 mm, having a diameter D = 75 mm. What is the focal length of the eyepiece if, when viewed with this scope, the Moon appears four times less bright than when observed with the naked eye? Take the pupil diameter to be 3 mm.
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Detailed solution. Format gif
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