Just now, a double rainbow appeared outside the window. Colleagues stopped their work and gathered in front of the window excitedly, patting with their mobile phones. Looking at the circle of friends, double rainbow photos taken from various angles, different directions and different places have occupied the layout of the circle of friends.
This kind of natural miracle has its own flow, which is really unparalleled.
Rainbow occupies a place in myth because of its beautiful and incomprehensible phenomena. Only after Galileo's monograph on the characteristics of light appeared can we explain the rainbow phenomenon.
In China mythology, Nu Wa tried to make up the sky with five-color stones, and the rainbow was the colored light emitted by the five-color stones.
In Greek mythology, the rainbow (Iris) is the messenger of communication between heaven and earth.
In Irish mythology, rich fairies put their treasures at the end of the rainbow.
Some people say that seeing double rainbows will bring good luck again and again, and it is impossible to test whether it is true or not, but when you see it, your mood is true.
How is the double rainbow formed? Asked about mother. Du Niang said that the double rainbow is a special phenomenon formed after two reflections in water droplets. A concentric rainbow with a slightly larger diameter and reversed color appears on the periphery of the original rainbow. The inner rainbow is called the main rainbow, the outer rainbow is red, the inner rainbow is blue, and the color is bright; The outer rainbow is called a sub-rainbow, the outer side is blue, the inner side is red, the color is dark, and it looks like a hair band.
It is verified by experiments that the main rainbow is caused by reflection at the water point, while the auxiliary rainbow is formed by two reflections. This is one of the wonders of nature. The corner is the brightest and the middle is the darkest.
Many times, two rainbows will appear at the same time, and a concentric but darker secondary rainbow (also called neon) will appear outside the ordinary rainbow. The secondary rainbow is formed by two reflections of sunlight in water droplets. When sunlight passes through water droplets, it will be refracted, reflected and then refracted again. Our common rainbow (main rainbow) is formed by the reflection of light in water droplets.
If light is reflected twice in a water drop, a second rainbow (neon) will be produced. The color arrangement of neon is opposite to that of the main rainbow. Because every reflection will lose some light energy, the brightness of neon lights is also very weak. The strongest reflection angle of the two reflections occurs at 50 to 53, so the position of the secondary rainbow is outside the main rainbow. Because there are two reflections, the color sequence of the auxiliary rainbow is opposite to that of the main rainbow, with the outer side being blue and the inner side being red. In fact, the auxiliary rainbow must follow the main rainbow, but sometimes it is invisible to the naked eye because of the low light intensity.
Therefore, every time we see a rainbow, there is another rainbow, but we may not see it every time.
There are many magical and beautiful things, which will make people have infinite reverie without scientific explanation. Once the reasons for its formation are explained clearly, it seems that there are less interesting and wonderful ideas.
This may also be the reason why there were so many fairy tales in ancient times, but now people's imagination is getting poorer and poorer.
Anyway, the rainbow in the sky is a beautiful thing. After all, the rain clears up, don't you think?