Problem: During a lunar eclipse, a picture of the moon (which has a diameter of 3.48 x 106 m and is 3.86 x 108 m from the earth) is taken with a camera whose lens has a focal length of 285 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?
Show me the all steps of the solution.