1. The problem statement, all variables and given/known data (a) How far from a 50.0-mm-focal-length lens must an object be placed it its image is to be magnified 2.00X and be real? (b) What if the image is to be virtual and magnified 2.00X? 2. Relevant equations Thins Lens Equation: 1/f = 1/do + 1/di Magnification Equation: M = hi/ho = -di/do 3. The attempt at a solution I see that we're only given three pieces of information: f=50.0mm M=2.00 The image is real However, I don't know how to incorporate the magnification equation with the Thins Lens Equation.