1. The problem statement, all variables and given/known data A magnifying glass has a converging lens of focal length 15.0 cm. At what distance from a nickel should you hold this lens to get an image with a magnification of +2.00? 2. Relevant equations 1/f = 1/di + 1/do m = -di/do or hi/ho 3. The attempt at a solution I tried to set it up like this: 1/15 = 1/di + 1/2do I don't know if that's even how it's set up or I tried to set up the magnification equation like this: m = -di / 2do and cross multiply to get m2do = /di. I don't know how to set the problem up properly.