1. The problem statement, all variables and given/known data . Three thin lenses, each with a focal length of 40.0 cm, are aligned on a common axis; adjacent lenses are separated by 52.0 cm. Find the position of the image of a small object on the axis, 80.0 cm to the left of the first lens. d=52cm between f=40cm d of object=80cm 2. Relevant equations 1/f=1/di+1/do 3. The attempt at a solution by the equation: 1/40cm = 1/80cm + 1/di (1st lens) di= 80cm 52-80cm= -28cm 2nd lens 1/40 = -1/28 + 1/di di (lens 2) = 16.47 52-16.47= 35.53cm 3rd lens 1/40 = 1/35.33+1/di di=-302.6 ---> This is where I'm stuck, the answer is supposed to be 134 cm to the left according to the book. Even if I add 104 cm to the answer, it still doesn't come close enough. Any thoughts on this?