How are Rainbows formed?

Rainbows are one of the most beautiful and outstanding workpiece of mother nature. Haven't we ever wondered how these rainbows are formed? Rainbows occur as a natural happening after a strong rain shower in the sky and is formed through raindrops, by the reflection and refraction of the Suns rays. It is mainly caused by the tiny droplets of water in the sunlight which is present in the atmosphere. 

Rainbow gets this colour with the help of the suns rays, and the rain drops that passes through sunlight, acts as tiny prisms and thus the different colours are formed in rainbows. A rainbow is always formed in the opposite direction. This a physics which is taking place and rainbows are optical illusions, it is not located at a specific location as we think it is. For a person to observe a rainbow, the sun should be be behind the observer and and there should be either rain drops or fog in front of the viewer to see the rainbow. 

The shape of a rainbow is semi circle as it only appears that way. The colours which appear are not pure spectrum as there is some mixing of colours and also how the human eye accepts this vision. We know the the colours of the rainbow are known as the VIBGYOR colours and those are the exact colours we see when a rainbow appears which takes place after a heavy rain shower.