characteristics in rainbow (atmospheric phenomenon)Occasionally, faintly coloured rings are seen just inside of the primary bow. These are called supernumerary rainbows; they owe their origin to interference effects on the light rays emerging from the water droplet after one internal reflection. ~via
Supernumeraries are created by small, almost same sized raindrops. ~via
Primary & secondary bows.The secondary is nearly always fainter than the primary. It's colours are reversed and more widely separated Light can be reflected more than once inside a raindrop. Rays escaping after two reflections make a secondary bow. ~via
