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Combination of Thin Lenses in Contact #8211; If two or more lenses are placed in contact, then total focal length of the combination, 1/f = 1/f<sub>1</sub> + 1/f<sub>2</sub> + 1/f<sub>3</sub> + … = Σ<sup>n</sup><sub>i = 1</sub> 1/f<sub>i</sub> Total power of combination, P = P<sub>1</sub> + P<sub>2</sub> + P<sub>3</sub> + #8230; = Σ<sup>n</sup><sub>i = 1</sub>P<sub>i</sub>
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