What is the color sequence of 7-color rainbow?

There are seven colors from the outer ring to the inner ring: red, orange, yellow, green, blue, indigo and purple.

Rainbow is an optical phenomenon in meteorology. When sunlight hits the water droplets in mid-air, the light is refracted and reflected, forming an arched color spectrum in the sky.

In fact, rainbows have countless colors. For example, there are many subtle differences between red and orange, but for simplicity, only seven colors are used as the differences.

Extended data

Seven-color light reason: rainbow is the dispersion and reflection of light caused by sunlight shining on small round water droplets in the air. When sunlight enters a water drop, it will be incident at different angles at the same time and reflected at different angles in the water drop. Among them, the reflection of 40-42 degrees is the strongest, forming a rainbow that people see.

The visibility of rainbow depends on the size of water droplets in the air. The bigger the water drop, the brighter the rainbow, and the smaller the water drop, the less obvious the rainbow is. Generally, in winter, the temperature is low, there are few water droplets in the air, and there is less chance of rain, so there is generally no rainbow in winter.