Figure 7
In all plots, = +3.23×10-6. The label `Cubic' means that the X-ray approximation of the ideal Cartesian oval was used to calculate the curve. Refer to Table 1 for the list of surfaces. (a, c, e) Comparison of cubic curve to paraxial ellipse and parabola of surfaces 2, 24 and 48, respectively. (b, d, f) Deviation of paraxial ellipse and parabola from cubic curve of surfaces 2, 24 and 48, respectively. Solid circles at the ends of a curve indicate that the curve terminates there because the slope dy/dx diverges. |