Confocal
From Wikipedia, the free encyclopedia
Confocal means having the same foci.
- In conic sections, it is said of two ellipses, two hyperbolas, or an ellipse and a hyperbola which share both foci with each other. If an ellipse and a hyperbola are confocal, they are perpendicular to each other.
- In optics, it means that one focus or image point of one lens is the same as one focus of the next lens.
