A Cassegrain telescope like that shown in Fig. 31.33b has 1.0-m focal length, and the

Chapter 31, Problem 70

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A Cassegrain telescope like that shown in Fig. 31.33b has 1.0-m focal length, and the convex secondary mirror is located 0.85 m from the primary. What should be the focal length of the secondary in order to put the final image 0.12 m behind the front surface of the primary mirror?

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