a. During a microscopy lab, your lab partner is observing a cell that is centered in the field of view. He complains that as he changes the objective lens from 20x to 40x, some of the features of the cell disappear. What explanation would you give him, and what advice would you give him on how to correct the problem?
b. The problem described in part a could have more than one cause. What is another explanation would you could give him, and what advice would you give him on how to correct the problem?