This physics video tutorial focuses on a multiple two lens system that contains a diverging lens and a converging lens. It provides the thin lens equation needed to solve the problem as well as the formula for the lateral magnification. It also provides the ray diagram for the convex lens and the concave lens. It explains the difference between a real image and a virtual image as well as how to determine if the image formed is upright or inverted, enlarge or reduced, real or virtual. In addition, it shows you how to calculate variables such as the focal length, image and height distance.