A rainbow is an optical and meteorological phenomenon that is caused by reflection of light in water droplets in the Earth's atmosphere, resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured arc.
Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.
In a "primary rainbow", the arc shows red on the outer part and violet on the inner side. This rainbow is caused by light being refracted while entering a droplet of water, then reflected inside on the back of the droplet and refracted again when leaving it.
In a double rainbow, a second arc is seen outside the primary arc, and has the order of its colours reversed, red facing toward the other one, in both rainbows. This second rainbow is caused by light reflecting twice inside water droplets.
Read more about Rainbow: Overview, Visibility, Number of Colours in Spectrum or Rainbow, Explanation, Scientific History, Culture
Famous quotes containing the word rainbow:
“One doesn’t look at a rainbow any longer that lasts a quarter of an hour.”
—Johann Wolfgang Von Goethe (1749–1832)
“and Venus among the fishes skips and is a she-dolphin
she is the gay, delighted porpoise sporting with love and the sea
she is the female tunny-fish, round and happy among the males
and dense with happy blood, dark rainbow bliss in the sea.”
—D.H. (David Herbert)
“The Rainbow comes and goes,
And lovely is the Rose,”
—William Wordsworth (1770–1850)