Under what circumstances will a rainbow be generated? How is a rainbow formed?

Rainbow is actually a natural optical phenomenon after rain. First of all, let me talk about how we can make artificial rainbow in our lives. As long as we understand it, we will probably know the principle; first: You can take a Mitsubishi mirror and turn on the flashlight, so that the shadow cast by it will produce a rainbow; second: you can also use a glass water cup, pour water into it, and place a lens inside to ensure that the environment is completely dark. , and then shine a flashlight on the lens inside, and you can also see a rainbow; how is the rainbow in the sky usually formed? In fact, when it rains, the sun's rays are refracted into the raindrops, creating a rainbow. The sun is equivalent to a flashlight, and the raindrops are equivalent to mirrors. It's such a simple principle.

However, rainbows do not only appear on rainy days. Rainbows can also be seen in mist, spray, heavy fog, and dew; the phenomenon of rainbows , it can also be said to be the best gift that sunshine gives to us people on earth.

The rainbow is made up of seven colors, namely red, orange, yellow, green, blue, indigo, and purple. According to other people, the temperature is generally lower in winter and water droplets are less likely to exist. , there is less rain, so there will be no rainbow phenomenon in winter.

There is another situation that is sometimes reported in the news, which is referred to as "double-layer rainbow". This kind of rainbow is relatively rare, and it is formed by two reflections in the water droplets. As for how to see the physical phenomenon of a rainbow, two conditions must be met: first, you must be between the sun and the rain; second, the angle between the rain and the human eye must be approximately between 40° and 42°; All in all, if we want to see a rainbow, we must go out; although the rainbow is beautiful, we must also pay attention to driving safety on the road, because some people look at the rainbow and cause dangerous situations while driving on the road.

Finally, I quote a famous saying that everyone often says: How can we see a rainbow without experiencing the wind and rain of nature?