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 × 106m and is 3.86 × 108m from the earth) is taken with a camera whose lens has a focal length of 320mm.
Question- What percent is this of the width of a 24mm × 36mm color slide?
I need experts help in the above question.