1. The problem statement, all variables and given/known data Where on the axis of a concave mirror would you place an object to get a half-size image? Express the object distance in terms of the focal length f. Follow the sign convention. 2. Relevant equations (1/q)+(1/p)=(1/f) f=(2/R) 3. The attempt at a solution I attempted to use the object distance plus image distance to solve for f (I just got f=q+p), but the online hw system says that is wrong. Are these the correct formulas and what should I be doing?