1. An object is located at x - 0. At x = 2.50cm is a converging lens is with a focal length of 2.00cm, at x - 16.5cm is an unknown lens, and at x - 19.8cm is another converging lens with magnification of -4. An upright image is formed at x - 39.8cm. For each lens, the object distance exceeds the focal length. The magnification of the system is 6.84. (a). What is the magnification of the unknown lens? [7 marks] (b) Using the answer in part (a) [1 1 marks] 1. What is the image disaince of the unknown lens? ii. Find the focal length of the unknown lens. ili. Is the unknown lens converging or diverging? (c) What is the focal length of the converging lens placed at x = 19.8cm? [6 marks]