Introduction:
A rainbow is an optical and meteorological phenomenon that causes a spectrum of light to appear in the sky, when the Sun shines on to droplets of moisture in the Earth's atmosphere. It takes the form of a ulticoloured 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.
Rainbows can be observed whenever there are water drops in the air and sunlight shining from behind at a low altitude angle. The most spectacular rainbow displays happen when half the sky is still dark with raining clouds and the observer is at a spot with clear sky in the direction of the sun. The result is a luminous rainbow that contrasts with the darkened background.
Beautiful Images:
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| Beautiful Image Of Rainbow |
.jpg "Rainbow Picture") |
| Beautiful Image Of Rainbow |
.jpg "Rainbow Image")
.jpg "Rainbow Picture")
.jpg "Rainbow Picture")
.jpg "Rainbow Image")
.jpg "Rainbow Photo")
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