1. The problem statement, all variables and given/known data Two identical converging lenses have focal lengths of 15 cm and are aligned on the same principal axis. They are separated by a distance of 120 cm. An object sits a distance of 21 cm to the left of the left lens. What is the total magnification of the two lenses? 2. Relevant equations Thin lens equation 1/f=1/do+1/di magnification equation m=di/do 3. The attempt at a solution Lens 1: 1/.15m=1/.21+1/di d-i=0.525m m=0.525m/0.21m=2.5 Lens 2: 1/.15=1/(.21+1.20m)+1/di d-i=0.168m m=0.80 m-total=0.80+2.5 ???