1. The problem statement, all variables and given/known data A concave mirror of focal length 20cm forms an image which is three times the height of the object. Find the distance of the object from the mirror if: 1: The image is real 2: The image is virtual 2. Relevant equations 1/u + 1/v = 1/f m = v/u 3. The attempt at a solution f = 20cm u = ? v = ?