Rainbow - Wikipedia, the free encyclopedia

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** Rainbow **

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For other uses, see Rainbow (disambiguation).
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Double rainbow and supernumerary rainbows on the inside of the primary arc.
The shadow of the photographer's head on the bottom marks the centre of the
rainbow circle (antisolar point).

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.

*Contents*

· 1 Overview
· 2 Visibility
· 3 Number of colours in spectrum or rainbow
· 4 Explanation
· 5 Variations

· 5.1 Multiple rainbows
· 5.2 Twinned rainbow
· 5.3 Tertiary and quaternary rainbows
· 5.4 Higher-order rainbows
· 5.5 Supernumerary rainbow
· 5.6 Reflected rainbow, reflection rainbow
· 5.7 Full circle rainbow
· 5.8 Monochrome rainbow
· 5.9 Rainbows under moonlight
· 5.10 Fogbow
· 5.11 Circumhorizontal arc
· 5.12 Rainbows on Titan

· 6 Scientific history
· 7 Culture
· 8 Gallery
·


Source: en.wikipedia.org/wiki/Rainbow


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