Solve the following problem given below:
Problem: A microscope with a tube length of 200mm achieves a total magnification of 800× with a 40× objective and a 20× eyepiece. The microscope is focused for viewing with a relaxed eye.
Part I: How far is the sample from the objective lens?
Please include each step and the equations you used to find how far is the sample from the objective lens, Thanks? Express your answer using two significant figures.