Solve the all parts of given question:
Question: The image of a tree on a 35 mm color slide is 1.3 mm high. It is to be projected onto a screen 7 m from the slide, and is to appear 602 mm high.
Part A: What focal length lens (in meters) is needed?
Part B: What is the distance in meters between the lens and the slide?
Part C: What is the magnification of the system?
If possible just a brief explanation how you got the answer? Thanks.