The table below shows measurements of magnification versus object distance for a lens. Determine a quantity that, when you plot object distance against it, should give a straight line. Make your plot, establish a best-fit line, and use your line to find the focal length of the lens.

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Object distance, s (cm) 10.1 29.2 51.6 78.3 98.9 Magnification, M 1.31 4.77-4.38-1.27 -0.724