What's the difference between rainbow and neon?

Different formation principles have different characteristics.

1, the formation principle is different: rainbow is a natural phenomenon. When the sun shines on the water droplets in the air, the light will be refracted, reflected and refracted, and finally a colorful halo will be formed. Neon is an atmospheric optical phenomenon, which appears at sunset or sunrise. In thunderstorm weather, when light passes through ice crystals or water droplets in the atmosphere, it will be refracted twice and reflected once, forming inner ultraviolet red.

2. Different characteristics: the rainbow is characterized by a semicircle, and the colors are red, orange, yellow, green, blue, indigo and purple from outside to inside, while the neon is characterized by purple, indigo, blue, green, yellow, orange and red from inside to outside.