5-1 Construct the envelope of the light rays emitted from a radiant point source at infinity after reflection by the semi-circle. ***By the cirle***
5-2 Construct the envelope of the light rays emitted from a radiant point source at the circumference after reflection by the same circle.
5-3 Construct the envelope formed by a fix diameter of a circle rolling along a fixed circle of the same size
5-4 Construct the envelope formed by a fix diameter of a circle rolling along a fixed circle twice the diameter.
5-5 Construct the envelope formed by a fix diameter of a circle rolling along a fixed circle (1/3) the diameter.
5-6 Construct the envelope formed by a fix diameter of a circle rolling along a fixed circle three the diameter.
5-7 Construct a design
5-8 Construct the nested squares
5-9 Construct nested triangles
5-10 Construct this pattern
5-11 Construct the family of ellipses
5-12 Construct the concentric and coaxial ellipses of constant area
5-13 Construct this pattern
5-14 Construct this pattern
5-15 Construct the reflections of a light ray trapped inside a reflective ellipses(two case)
