Tablel. Image and Object Distances Distance from 1/ do 1/ d Image size, m Object size, m light source to m-1 m-1 screen (m) 0.50 0.60 0.70 0.80 0.90 Table 2. Focal Length F. m Result from x-intercept Result from y-intercept % difference between results from intercepts Average of results from intercepts % error Table 3. Magnification M calculated from image and object distances. (Formula 2) M calculated from image and object sizes (Formula 3) % differences