Conic section parameter type
Diffraction line
Corresponding focal curve
Ellipse
Hyperbola
Semi-major-axis
a
Semi-minor axis
b
Hyperbola
Ellipse
Semi-major-axis
a
Semi-minor axis
b
b
Parabola
Parabola
Focal parameter
p
p
| Conic section parameter type | Diffraction line | Corresponding focal curve |
|
| Ellipse | Hyperbola |
| Semi-major-axis | a |
|
| Semi-minor axis |
| b |
|
| Hyperbola | Ellipse |
| Semi-major-axis | a |
|
| Semi-minor axis | b | b |
|
| Parabola | Parabola |
| Focal parameter | p | p |