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Power of a lens

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Two thin lenses of power +7D and -3D are in contact. What is the focal length of the combination?

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\(P = \frac 1f\) when f is in m

\(f = \frac 1P = \frac 1{P_1 + P_2}\)

\(f = \frac1{7+(-3) } = \frac 14 m = 25cm\)

∴ focal length of the combination is 25 cm.

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