Why do rainbows appear in the sky?

In summer, after the rain, the dark clouds fly away and the sun reappears. In the sky opposite the sun, there will be a semi-circular rainbow.

Rainbow is formed because sunlight is emitted in the air and refracted into water droplets.

We know that when sunlight passes through the prism, the direction of the foreground will be deflected and the original white light will change.

The line is broken down into seven color bands: red, orange, yellow, green, cyan, blue and purple.

After the rain, there are many tiny water droplets floating in the air. When the sun shines on them, they will refract and disperse.

Into seven colors of light. Many small water droplets refract sunlight at the same time, and then reflect into our eyes, and we will see one.

A semicircle rainbow. The ribbons of the rainbow are distinct, and the red ones are on the outermost side, followed by orange, yellow, green, cyan, blue and purple.

Color.

The size of water droplets in the air determines the bright color and width of the rainbow. When the water drops in the air are large, the rainbow is bright. also

Relatively narrow; On the contrary, if the water drops are small, the rainbow will be light and wide.

We can't see the rainbow when facing the sun, but only when facing the sun can we see the rainbow, so the rainbow in the morning appears.

In the west, the rainbow at dusk always appears in the east. But we can't see it. We can only see it from the sky by plane.

The appearance of rainbow is related to the weather change at that time. Generally, we can infer from the position of the rainbow in the sky that it will appear at that time.

It is sunny or rainy. When there is a rainbow in the east, it is not easy to rain locally, and when there is a rainbow in the west, it may rain locally.

Very sexual.

The visibility of rainbow depends on the size of water droplets in the air. The bigger the water drop, the brighter the rainbow, and the smaller the water drop, the less obvious the rainbow is.

Generally, in winter, the temperature is low, there are few water droplets in the air, and there are few opportunities for showers, so rainbows generally do not appear in winter.