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The telescope at Yerkes Observatory in Wisconsin has an objective whose focal length is 19.4 m. Its eyepiece has a focal length of10.0 cm.

(a) What is the angular magnification of the telescope?

(b) If the telescope is used to look at a lunar crater(diameter = 7910 m), what is the size of the first image, assuming the surface of the moon is 3.77 × 108 m from the surface of the earth?

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