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The Moon was photographed with a telescope, the objective of which had a diameter of 20...

The Moon was photographed with a telescope, the objective of which had a diameter of 20 cm and focal length of 150 cm. The exposure time was 0.1 s. (a) What should the exposure time be, if the diameter of the objective were 15 cm and focal length 200 cm?(b) What is the size of the image of the Moon in both cases?

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