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The moon's diameter is 3.48 x 106 m, and its mean distance from the earth is 3.85 x 108 m. The moon is being photographed by a camera whose lens has a focal length of 60.0 mm. (a) Find the diameter of the moon's image on the slide film. (b) When the slide is projected onto a screen that is 20.0 m from the lens of the projector (f = 180.0 mm), what is the diameter of the moon's image on the screen? 

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