1. The problem statement, all variables and given/known data Given the following information: convex mirror, focal length (f) = 12.5 metres, height object (ho) = 5 metres, height image (hi) = 1 metre. Find distance object (do) and distance image (di). 2. Relevant equations 1/f = 1/do + 1/di Magnification= -hi/ho = di/do 3. The attempt at a solution I found that the magnification is -0.2. Rearranging the magnification equation I found that di=-0.2do and that do=-5di My intention was to substitute one of the two into 1/f = 1/do + 1/di I tried to make the denominators equal after substituting in di=-0.2do however my answer was incorrect. Correct answers are do = 50 metres, di = -10 metres I don't understand how to mathematically solve this problem. Any help would be greatfully appreciated.