Ecran

Objet

lentille

L1 = (9.12, 2.4)
L2 = (9.04, -2.54)
a = Segment(L2, L1)
O = Midpoint(a)
b = LineBisector(a)
F' = Point(b)
F = Mirror(F', O)
B = (2.98, 1.48)
c = OrthogonalLine(B, b)
A = Intersect(c, b)
C = Point(b)
d = OrthogonalLine(C, b)
D = Point(d)
D' = Mirror(D, C)
e = Segment(D, D')
u = Vector(A, B)