How is the rainbow formed? In what weather can we see rainbows?

Rainbow is a common phenomenon in our daily life. As long as there are water droplets in the air, the rainbow phenomenon will be found when the sun shines at a low angle. When the sun shines into a water drop, it will be refracted first and then reflected twice to form a rainbow. Rainbow phenomenon usually appears in the afternoon, especially when it just clears up after rain. At this time, there is less air dust and water droplets, which will make the rainbow easier to see under the sunlight. Another is that you will often see rainbows near waterfalls, especially when your back is to the sun.

Everyone will think that the rainbow is beautiful, which is also because of the change of the angle and color of light irradiation, so the seven colors will be arranged beautifully together and finally form a rainbow. Because sunlight itself has different colors, it will form seven ribbons when it shines on water droplets. So will rainbows, because the size of water droplets in the air will determine the brightness and size of rainbow colors. If the water drops are bigger, the color of the rainbow will be brighter and more beautiful. Under normal circumstances, you can't see the rainbow with your back to the sun. You can only see the rainbow with your back to the sun.

Many people think that the rainbow is curved. In fact, this is because when normal people look at the rainbow, they will find that the rainbow is semi-arc in the air. However, if we look at the rainbow from a higher place, we will find that the rainbow is round, and the rainbow we see is incomplete, just because our position blocks the rainbow, which is the real shape. At the same time, it should be noted that the position of the rainbow is not fixed, but will change, so it is difficult to see what the side of the rainbow looks like.

Finally, if you want to really understand the rainbow, you can also make it by hand.