1. The problem statement, all variables and given/known data Quick question I can visualise but not determine mathematically.. The question in my text says: Determine the MINIMUM size of a flat vertical mirror that a person 178 cm can see his whole image. It suggest that a ray diagram will help. 3. The attempt at a solution well I could tell that the mirror should be less than the total 178 cm.. but even with the use of a ray diagram i keep getting a 1 to 1 thing going on... if object height equals 178cm and image height equals 178cm...my only thoughts are with the use of a ray diagram i guess there must be some critical for the reflected rays i should be looking for?