1. The problem statement, all variables and given/known data A convex mirror of focal length 10cm forms an image that is one quarter the size of the object. Find the position of the object and the image. 2. Relevant equations -1/f = 1/u + 1/v m = v/u 3. The attempt at a solution m = 1/4 f = 10cm -1/10 = 1/u + 1/0.25u I think that 1/u + 0.25u is the problem because I cant find the common denominator. The answer to the question is u = 30cm, v = 7.5cm just in case someone thinks I want them to do my homework for me. I just want to understand how to get it. Thanks.