Here is what the page “Can You Turn a Rainbow Back into White Light?” contains. Try Tab Traces and everything else Opera has to offer: Newton proved that white light was made of all the colours of rainbow by recombining the spectrum. He used a second prism and a convex lens.
3b1b why different wavelengths of light bend different amounts: You can support me on Patreon and get access to the exclusive Discord: The full version stays on the original page, which this listing opens directly.