Raytracing and image formation Obleci Figure 3: Raytracing and image formation on graph paper - Draw a concave circular arc (R: ~10cm) on graph paper to model a spherical mirror ' Mark the center of curvature O and the focal point F Draw three objects (vertical arrows) at: the center of curvature, between the center and focal point, between the focal point and mirror Trace the principal rays and construct the images - Measure do, di, ho, hi for each image Calculate magnification m=hi/ho for each image - Calculate 1/di+1/do for each image and compare it to 1/f