A large number of thin converging lenses each of focal length f are placed at equal distances l from each other so that their optical axes coincide. The distance l is negligibly small as compared to the focal length f. 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 its passage through the stack of the lenses.
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