1. The problem statement, all variables and given/known data " A converging lens has a focal length f. The object location at magnification equal to -1 is? " 2. Relevant equations m = -S'/S 3. The attempt at a solution Here is my solution: M= -1 , S=?? M= -S'/S -1 = -S'/S S= -S'/-1 S=S' And from case 2 that says if an object is placed at 2F the image will be inverted, real , and have the same size as the object. And from the last sentence ( backed up with my conclusion of S=S' ) the object is placed at 2F. Is my answer correct?