Figure 5.9 illustrates an aligned system consisting of three thin lenses. The system is located in air.

Question:

Figure 5.9 illustrates an aligned system consisting of three thin lenses. The system is located in air. Determine:
(a) The position of the point of convergence of a parallel ray incoming from the left after passing through the system;
(b) The distance between tile first lens and a point lying on the axis to the left of the system, at which that point and its image are located symmetrically with respect to the lens system.