1. The problem statement, all variables and given/known data A 1.60 cm tall object is 20.0 cm to the left of a lens with a focal length of 10.0 cm . A second lens with a focal length of 36.0 cm is 44.0 cm to the right of the first lens. 2. Relevant equations 1/f = 1/di + 1/do , hi/ho = di/do 3. The attempt at a solution calculate distance of image 1/f = 1/di + 1/do 1/10cm - 1/20cm = 1/di 20cm = di with a image twice the length of the object, it must be a converging lens. its inverted and real. image of first lens becomes object of second lens. do = 20 +44 = 64cm f = 36cm 1/36 - 1/64 = 1/di 82.28cm = di But MP says its wrong....? The only thing I can think of is that the signs are wrong somewhere, but the image is real so it should be positive..... Any and all help is appreciated!