Answer: The principal indication given by a double bow is that the raindrops that are refracting and reflecting sunlight are of medium to large size, rather than being very small or tiny droplets.

Rainbows, that is... below are two very nice photos of well-formed rainbows sent to us by Bill Dinwiddie of Garner. He shot these pictures on US 40 the afternoon of May 18th around 5:30 PM. You can ...