physics of rainbows - SERP Analysis

https://www.physicsclassroom.com/class/refrn/lesson-4/rainbow-formation

https://en.wikipedia.org/wiki/Rainbow

https://global.canon/en/technology/s_labo/light/001/02.html

http://hyperphysics.phy-astr.gsu.edu/hbase/atmos/rbowpri.html

https://education.nationalgeographic.org/resource/rainbow/

https://www.youtube.com/watch%3Fv%3D24GfgNtnjXc

https://inters.org/physics-of-rainbow

https://www.astronomy.com/science/how-to-read-rainbows/

https://ssec.si.edu/stemvisions-blog/science-rainbows

https://science.howstuffworks.com/nature/climate-weather/atmospheric/question41.htm