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internal reflection of sunlight inside raindrops and/or mist droplets.

Answer:

Light from the sun appears to be colourless but it is really made up of all seven visible colours (red, orange, yellow, green, blue, indigo and violet). When the "white" sunlight enters a raindrop it breaks up into the various colours (due to a process called refraction) and bounces back out of the drop towards your eyes when it reflects off the rear surface of the raindrop.

For this to occur the sun has to be shining and you have to be between where the sun is in the sky and the rain or mist droplets are located. You can make your own rainbow with a garden hose set to mist on a sunny day or by using a prism,

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