hello, 1. The problem statement, all variables and given/known data A lens has a focal length of 20 cm and a magnification of 4. How far apart are the object and the image? 2. Relevant equations m=di(image)/do(object) 1/di + 1/do = 1/f 3. The attempt at a solution Well, I don't really know what to do, I feel like I don't have enough information. Your help will be very appreciated!