*65. (Ill) A diverging lens is placed next to a converging
Chapter 23, Problem 65(choose chapter or problem)
*65. (Ill) A diverging lens is placed next to a converging lens of focal length /c. as in Fig. 23-42. If /T represents the focal length of the combination, show that the focal length of the diverging lens. /D. is given by J_ _ 1___1_ fo /r fc
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