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A rainbow is formed by light passing through a prism (the prism being a raindrop) and then different colours going through the prism at different speeds, light is made up of about 6 colours: Red, Orange, Yellow, Green, Blue and v some colours of light are generally faster that others, red being the fastest travelling colour and violet being the slowest. This means that rainbows always have the same order of colour. A double rainbow is simply when there is two sources of light, and the second source travells through a different raindrop, causing a second rainbow.

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