1. The problem statement, all variables and given/known data An object is 12.0 cm in front of a convex mirror. When the convex mirror is replaced with a flat mirror, the image distance is 5.0 cm farther away from the mirror. What is the focal length of the convex mirror? 2. Relevant equations f=-1/2R 1/do+1/di=1/f 3. The attempt at a solution (1/0.12m)+1/di=1/f ? 12+5cm=17cm=0.17m (1/0.17m)+1/di=1/f ?