Periscope反射：通过反射观察鸟的几何现象

GeoGebra 命令及参数

1. Segment(A, B) → a
2. Segment(B, C) → b
3. Segment(C, D) → c
4. Segment(D, E) → d
5. Segment(E, F) → e
6. Segment(F, G) → f
7. Segment(G, H) → g
8. Point(g) → I
9. Point(f) → J
10. Segment(I, J) → h
11. Point(c) → K
12. Point(b) → L
13. Segment(K, L) → i
14. Midpoint(h) → M
15. Midpoint(i) → N
16. OrthogonalLine(M, h) → k
17. Midpoint(i) → O
18. Segment(P, O) → j
19. OrthogonalLine(O, i) → l
20. Mirror(P, l) → P'
21. Mirror(O, l) → O'
22. Segment(P', O') → j'
23. Intersect(h, j') → Q
24. OrthogonalLine(Q, h) → m
25. Mirror(P', m) → P''
26. Mirror(O', m) → O''
27. Segment(P'', O'') → j''
28. Segment(O, Q) → n
29. Segment(Q, O'') → p
30. Polygon(J, G, I) → poly1, i_1, j_1, g_1
31. Polygon(K, C, L) → poly2, l_1, k_1, c_1
32. Ray(Q, O'') → q
33. Midpoint(n) → R
34. Midpoint(j) → S
35. Point(q) → T
36. Point(j) → W
37. Segment(K, Z) → r
38. OrthogonalLine(Z, r) → s