On rainbows. Part 5--To the ponderer on October 17, 2018 diffraction dispersion refraction subjective prismatic observations +
Collaboration Day 9 on March 16, 2017 Descartes diffraction longitudinal spectral distribution Newton's rings theory of the rainbow +
Collaboration Day 8 on March 01, 2017 Descartes diffraction experimentum crucis longitudinal propagation longitudinal spectral distribution objective prismatic experiments Snell's law subjective prismatic experiment +