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Here is the problem which I am struggling on, please help me!

Problem: During a lunar eclipse, a picture of the moon (which has a diameter of 3.48 × 10⁶ m and is 3.86 × 10⁸ m from the earth) is taken with a camera whose lens has a focal length of 320 mm.

Part A. What is the diameter of the image on the film?

Part B. What percent is this of the width of a 24mm × 36mm color slide?

I need help for above question.

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Reference No.:- M91227201

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