Table 4. Image and Object Distance of a Concave Mirror Distance so ' m S,' m 1/s 1/ S, Image size, Object size, from light m- m- m source to screen, m 0.35 0.30 0.25 0.20 0.15 Table 5. Focal Length of a Concave Mirror f, m Result from x-intercept Result from y-intercept % difference between results from intercepts Average of results from intercepts Focal distance from intercepts % error Table 6. Magnification of a Concave Mirror M calculated from image and object distances. (Formula 5) M calculated from image and object sizes (Formula 6) % differences