Since rainbows are composed of a continuous spectrum, different people, most notably across different cultures, identify different numbers of colours in rainbows. The seven colours shown below are a typical representation for Western Civilization and Indian Civilization.
Red, Orange, Yellow, Green, Blue, Indigo, Violet
Rainbows can be observed whenever there are water drops in the air and sunlight shining from behind a person at a low altitude angle (on the ground). The most spectacular rainbow displays happen when half of 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.
The rainbow effect is also commonly seen near waterfalls or fountains. The effect can also be artificially created by dispersing water droplets into the air during a sunny day. Rarely, a moonbow, lunar rainbow or night time rainbow, can be seen on strongly moonlit nights.
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