Question: 3 4 . 9 0 * Two Lenses in Contact. ( a ) Prove that when two thin lenses with focal lengths f 1 and

34.90* Two Lenses in Contact. (a) Prove that when two thin lenses with focal lengths f1 and f2 are placed in contact, the focal length f of the combination is given by the relationship
1f=1f1+1f2
3 4 . 9 0 * Two Lenses in Contact. ( a ) Prove

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