WHAT IS A RAINBOW AND HOW IS IT MADE.
A rainbow is the result of sunlight from behind an observer being both reflected and refracted as it passes through raindrops falling ahead.
Reflection happens at the far side of each raindrop and the light is directed back towards the observer.
Refraction involves the separation of sunlight into its component colours. Each colour is of a slightly different wave length of radiation.
The width of the rainbow and the predominant colour depends on the size of the raindrops.
Large drops produce wide bows in which red predominates and small drops result in a narrow bow in which white predominates.
The colours are arranged through the rainbow from top to bottom, RED ORANGE YELLOW GREEN BLUE INDIGO VIOLET.
Sometimes thre is a second rainbow outside the first and in this the order of the colours is reversed. This happens as the sunlight is reflected twice insead of once.
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