0 3. A large number of thin converging lenses each of focal length fare placed at equal distances I from each other so that their optical axes coincide The distance / is negligibly small as compared to the focal length A light ray is made to incident parallel to the common optical axis on the first lens at a distance h from the optical axis as shown in the figure Deduce a suitable equation of the path, the ray will trace during passage through the stack of the lenses.