1. The problem statement, all variables and given/known data A 6mm diameter microscope objective has focal length 9mm. What object distance is required to achieve a lateral magnification of -40? 2. Relevant equations mobj=-L/fobj 3. The attempt at a solution -40x=-L/9mm L=360mm Why isn't the answer 360mm? I think it might have something to do with the diameter of the lens, but I'm not completely sure. Can someone explain? Thanks!