1. The problem statement, all variables and given/known data If lateral magnification is negative what does that mean? 2. Relevant equations m = -di/do 3. The attempt at a solution From what I understand that focal distance for converging devices (concave mirrors and convex lens) is always positive. So this would make m="-" since di= "+". Also that a negative lateral magnification would mean less power. My question are: 1) Is the above correct? 2) If the object was within the focal point the image would be virtual and upright, what would happen to power then? 3) If I increase the focal distance would that mean I would decrease the power of the lens or mirror based on this formula: P=1/f? 4) Based on this formula: P=1/f = 1/di + 1/do, the farther the object is from the lens or mirror the greater power is?