Dear programmers,

sorry for writing in English, but my French is real bad.

I use my Casio fx-CG20 mostly for simulation programs, which cover fields of physics, astrophysics or similar topics. I published some of them here. You may try my map projection program which shows how different a world map look like if you present it by different methods. You can look at the formulae in it: Most of them are rather simple.

In the last days I thought about wave optics and experimented with it. I found it very interesting, that a real image can be constructed simply by overlapping (interfering) of spherical waves from a couple of points. You don't need to take into account the laws of reflection or refraction, the wavelets konws these law for themself? Very exciting. You may look of the simplest one, diffraction at a slit or the more complicated image formation by a parabolic mirror.

All programs need C.Basic from sentaro21.