1. The problem statement, all variables and given/known data I attatched 2 images, the problem, and my work (including the formula needed) This "double shift" is what's getting me. Is it going 2% towards the object, and 2% from it? Or I'm I suppose to use 2 functions:F'=(f+xf) and F'=(f+yf) where x + y = 0.04? 2. Relevant equations See pic. 3. The attempt at a solution See pic.