The Mountain Rainbow Stock Photo

Rainbow, also known as Tiangong Hakka dialect, Tianhong, Jiang and so on, is an optical phenomenon in the weather. When the sunlight shines on the water drop in the air, the light is refracted and reflected, forming an arched seven color spectrum in the sky. From the outer ring to the inner ring, it is red, orange, yellow, green, blue, indigo and purple. In fact, there are countless colors of rainbow, for example, there are many subtle differences between red and orange, but for the sake of simplicity, only seven colors are used as the difference.