Experimentation - bisoptic of parabolas
Multi-experimentation
You can change:
1. The parameter p of the parabola
2. The parameter a = tan (theta), where theta is the isoptic angle (i.e. the angle under which the parabola is viewed, i.e. the angle between the tangents to the parabola through the given point).
The isoptics of a parabola are branches of a hyperbola.