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The power of a lens is given as 1/f. The units are not in Watts. The units are diopters, 1/m. So a lens with a

The power of a lens is given as 1/f. The units are not in Watts. The units are diopters, 1/m. So a lens with a short focal length has the potential to provide more magnification than a lens with a longer focal length. The same is true for mirrors. What is the focal length of a lens with P = +4.0 diopters? What is the focal length of a lens with P = -2.0 diopters?

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