Akash, nothing surprising about double rainbows. A raindrop has two surfaces and in principle can have at least two internal reflections; one which stronger and the others which are weaker. But you only see two rainbows because the intensity of others...

Akash, nothing surprising about double rainbows. A raindrop has two surfaces and in principle can have at least two internal reflections; one which stronger and the others which are weaker. But you only see two rainbows because the intensity of others is too weak.

Close to the horizon, to the right of the primary rainbow, you can just make out the secondary rainbow, whose colors are in reversed order compared to the primary rainbow. Nice catch!