Students in a physics laboratory use an optical bench to project real, focused images of an illuminated object onto a screen using a thin converging lens. For several object positions, the students measure the image distance \(d_i\) from the lens to the screen and determine the magnitude of the lateral magnification \(|m|\). The best-fit line of their data for \(|m|\) versus \(d_i\) is shown in the graph. Based on the graph, what is the focal length of the converging lens?