1. The problem statement, all variables and given/known data A convex lens and a concave lens both of 6cm focal length are placed to give an object which is 5cm from the convex lens of magnification of 10. How far are the lenses apart? 2. Relevant equations 1/f = 1/u + 1/v Magnification=v/u 3. The attempt at a solution Lens One: Convex f=6cm u=5cm v=? 1/f = 1/u + 1/v 1/6 = 1/5 + 1/v V=-30 Lens Two: Concave f=-6 (concave) To get a magnification of 10: 10 = v/u That's all I have. I have no idea how to work out the distance between the two lenses. Can anyone help please?