本题目来源于试卷: Light: Geometric Optics，类别为 IB物理学
[问答题]
(a) Show that if two/ts (n dqvr+w( thin l8a/jdd8oz. e denses of focal lengths $f_1$ and $f_2$ are placed in contact with each other, the focal length of the combination is given by $f_{\mathrm{T}}=f_{1}f_{2}/(f_{1}+f_{2}).$
(b) Show that the power P of the combination of two lenses is the sum of their separate powers, $P$ = $P_1$+$P_2$.
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