If the Sun shines in the sky when it is raining, sunlight bounces off the raindrops and splits into different colours that you see as a rainbow. The colours you can usually see in a rainbow are red, orange, yellow, green, blue, indigo, and violet. When sunlight is reflected twice in the same raindrop you may see a double rainbow—a second rainbow that sits outside the main rainbow with its colours in the opposite order. There are also lunar rainbows (when moonlight passes through raindrops) and red rainbows (which happen at dawn or dusk), but these are rare.
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VID LAL
If the Sun shines in the sky when it is raining, sunlight bounces off the raindrops and splits into different colours that you see as a rainbow. The colours you can usually see in a rainbow are red, orange, yellow, green, blue, indigo, and violet. When sunlight is reflected twice in the same raindrop you may see a double rainbow—a second rainbow that sits outside the main rainbow with its colours in the opposite order. There are also lunar rainbows (when moonlight passes through raindrops) and red rainbows (which happen at dawn or dusk), but these are rare.