Thierry Delbar

Shows the behaviour of a diffraction grating as a function of the wavelength and of the outgoing angle. Good analogy that students will never forget ! …

101 puzzles on Ancient Egypt (24 in the program, 77 downloadable), each in 3 sizes: 16, 32 and 48 pieces, from easy to very difficult.2 modes: puzzle …

Shows the effect of a concave or convex mirror, and of a converging or diverging lens, not on light rays but on waves for different object distances.Y …

See how adding more and more terms, the Fourier series reproduces better and better a periodic function, for 4 different functions. See what is limiti …

Investigate the electric field, the field lines and the potential around 2 charges.Change the charges, the distances between them and see the effect.免 …

See the E and B fields of an EM wave, linearly or circularly polarized. See the effect of a polarizer.Change the wave length, the polarization, etc... …

Explore the interference between 2 waves as a function of the wave length, the distance between the sources and the phase angle. See the nodal and ant …

Investigate the vector product of 2 vectors and see how it behaves when you touch and drag one of the vectors. Very good tool for teachers and student …

Explore the velocity distribution of 1 or 2 gases, as a function of the temperature, the masses of the gases and the number of molecules. See the inst …