AfaIk, the novelty was, that the fractions of the rainbow, e.g. yellow, themselves do not split into a rainbow again if they are sent though a prism. That led to the conclusion that white sunlight is actually composed of light of different colours which cannot be decomposed further.
Way more entertaining than plague tbqf
AfaIk, the novelty was, that the fractions of the rainbow, e.g. yellow, themselves do not split into a rainbow again if they are sent though a prism. That led to the conclusion that white sunlight is actually composed of light of different colours which cannot be decomposed further.