* 94. (a) Show that if tw'o thin lenses of focal lengths
Chapter 23, Problem 94(choose chapter or problem)
* 94. (a) Show that if tw'o thin lenses of focal lengths J\ and f2 are placed in contact with each other, the focal length of the combination is given by /T = f\fi/(f\ + fz). (b) Show that the powrcr P of the combination of two lenses is the sum of their separate powers. P = P\ + P2.
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