Inspired by yesterday’s rainbow #mathsonamug #maths pic.twitter.com/GGmrzyUtHB
— Dr. Sean (@seanelvidge) January 13, 2016
Yesterday my (by far) most popular tweet was a picture of a rainbow. So I thought I would do a little diagram of what causes us to see a rainbow. The colours are reversed for a double rainbow because there is a second reflection. You can read a whole article about the process on Plus Magazine.