How did the double rainbow come about, and what does the double rainbow symbolize?

Rainbows are formed by the refraction of sunlight by small water droplets in the air.

When light is refracted and reflected once, it forms a rainbow.

Sometimes, light is refracted twice and reflected once to form a rainbow, but this rainbow is reversed.

In special cases, two rainbows will appear at the same time, which is a double rainbow.

Symbolizes nothing. You can think of it as a great memory in your life and that's it. Of course, you can take it as the beginning of your good fortune, and maybe your life will change because of the change in your attitude towards life.

Double rainbow is a special phenomenon formed after two reflections in the water droplet, a concentric rainbow with a slightly larger diameter and inverted color appears on the periphery of the original rainbow, and the inner rainbow is called the main rainbow, the outer side is red, the inner side is blue, and the color is brighter; The outer rainbow is called a secondary rainbow, the outer side is blue, the inner side is red, the color is darker, and the shape resembles a headband.

Experiments show that the main rainbow of the rainbow is caused by the reflection in the water point, while the secondary rainbow is formed by two reflections. This is one of the "miracles" of nature. The corners are the brightest and the middle is the darkest.

So, how exactly did the double rainbow come about? Why do we see only one rainbow so often? Science and technology reporters interviewed Huang Zhimin, an agricultural meteorological expert in Hubei Province, and answered these questions one by one.

The double rainbow is actually neon and rainbow.

Huang Zhimin said that when the air humidity is high, the water vapor in the air can be seen as countless small water droplets. When sunlight hits a small water droplet, two refractions and one reflection occur, the phenomenon of "refraction-reflection-refraction".

Sunlight is composed of 7 colors: red, orange, yellow, green, blue, indigo, and violet, and the first refraction will occur when it hits the water droplets, and due to the different wavelengths of these 7 colors, their deflection angles will be different, and then the sunlight will be decomposed into 7 monochromatic lights; After the refracted monochromatic light reaches the back of the water droplet, it will be reflected according to the reflection law. The reflected monochromatic light will return to this side of the incident water droplet, at which point a second refraction will occur and the water droplet will still be emitted as monochromatic light.

The red light with the shortest wavelength has the smallest refractive index in the water droplets, so that its outgoing light and the incident light constitute the maximum angle, and the violet light with the shortest wavelength has the largest refractive index in the water droplets, so that the refracted light and the incident light constitute the minimum angle, and other lights are distributed in order in it.

When we see a "rainbow" in the sky, it means that the sunlight is refracted and reflected in the water droplets, which means the existence of "neon". The formation of neon is similar to that of the rainbow, except that the sunlight undergoes two refractions and two reflections in the water droplet, that is, "refraction-reflection-reflection-refraction", because there is one more reflection process than the formation of the rainbow, the red light with the smallest refractive index is at the minimum angle between the direction of the red light and the direction of incidence, and the violet light with the largest refractive index is the maximum angle between the direction of the violet light and the direction of incidence.

The symbolism of the double rainbow is good luck and happiness.

The double rainbow will only appear after the rain, indicating that the dust of the pursuit will only achieve the desired result after a certain setback. It symbolizes the goal or hope that can be achieved after experiencing setbacks.

In addition, in the folklore that circulates abroad, it is also believed that seeing a rainbow is a symbol of luck.

How the Double Rainbow Forms Principle:

The principle of the formation of the double rainbow is because after the rain, the air is filled with fine water mist, when the sunlight passes through the water mist, the refraction of light will be formed, resulting in a Li Beizen beam of light dispersed into most colored light, which is what we call a rainbow. So the appearance of a double rainbow in the sky is a very common optical phenomenon.

At about 18:40 on July 14, 2014, a double rainbow spectacle appeared in Hebi City, Henan Province. At that time, it was raining lightly and the sun was coming out. At around 18:30, a bright rainbow appeared in Hebi City, and after more than 10 minutes, another rainbow appeared, and the double rainbow lasted for about 30 minutes.

At about 19 o'clock on July 19, 2016, the double rainbow could be clearly seen in most urban areas of Luoyang City, Henan Province, lasting about half an hour.

At 19:20 on August 1, 2016, the double rainbow can be clearly seen in Zhengzhou City, Henan Province.

If you encounter a double rainbow, it means perfection and is a symbol of luck. Some people even think that if a couple sees a double rainbow together, they will "hold the hand of the son and grow old with the son", which is really romantic just thinking about it.

Rainbows are most commonly seen in the afternoon to evening in summer, and are most likely to appear when the sky is clear after rain, and double rainbows are no exception. The rainbow will be easier to see when the air is less dusty and full of small droplets, the side of the sky is darker because there is still rain and clouds, and the observer has no clouds above or behind him and the sun is ridiculously visible.

Generally speaking, as long as there are plenty of water droplets in the air, less dust, high visibility, and the right angle of sunlight, it is easy to see it around a waterfall. However, since the double rainbow is the result of two reflections of light in a water droplet, it is rare to see a rainbow even in highland areas where rainbows are common, so being able to see a rainbow of socks after rain is a precious experience.