抛物线与双曲线的交点及透镜现象

GeoGebra 命令及参数

1. Point(yAxis) → F_1
2. OrthogonalLine(C, xAxis) → a
3. Parabola(F_2, a) → c
4. Hyperbola(F_1, F_2, D) → d
5. OrthogonalLine(E, a) → b
6. Intersect(c, b, 1) → F
7. Tangent(F, c) → e,
8. OrthogonalLine(F, e) → f
9. Mirror(b, f) → b'
10. Intersect(d, b', 2) → G
11. Tangent(G, d) → g,
12. OrthogonalLine(G, g) → h
13. Mirror(b', h) → b''
14. Vector(E, F) → u
15. Vector(F, G) → v
16. Vector(G, F_1) → w
17. Segment(F, F_2) → i