After it rains and the sky clears up, what natural phenomena will occur when the weather is clear?

1. Rainbow, also known as Tianhong, abbreviated as Hong, "Cai", as the name suggests, means "seven colors" and "color". "Rainbow", "Gong" represent the pronunciation, and "Chong" represents Why is the word "worm" next to the shape? Because in ancient times, people didn't know that rainbows were related to water droplets. They thought rainbows were insects that drink raindrops, so they used the word "worm".

Rainbow It is an optical phenomenon in meteorology. When sunlight shines on raindrops in mid-air, the light is refracted and reflected, forming an arched colorful spectrum in the sky. The colorful colors of the rainbow, from outside to inside, are: red, orange, Yellow, green, blue, indigo, violet.

Rainbow is a natural phenomenon caused by the reflection and refraction of light when sunlight hits water droplets in the air.

Rainbow [Natural Phenomenon] -

Causes

Optical Principles of Rainbow Formation Album

Rainbows are caused by sunlight hitting small, nearly round water droplets in the sky. It is formed by dispersion and reflection. When sunlight hits a water droplet, it will be incident at different angles at the same time, and will also be reflected at different angles within the water droplet. Among them, the reflection between 40 and 42 degrees is the strongest, causing the rainbow we see. Cause this During reflection, sunlight enters the water droplet, is refracted once, then reflects on the back of the water droplet, and finally refracts again when leaving the water droplet. Because water has a dispersive effect on light, the refractive index of light of different wavelengths is different. The refractive angle of blue light is larger than red light. Since light is reflected in water droplets, the spectrum seen by the observer is inverted, with red light at the top and other colors at the bottom.

In fact, as long as there are water droplets in the air, the sunlight is If the observer's back is illuminated at a low angle, an observable rainbow phenomenon may occur. Rainbows most often appear in the afternoon, when the sky just turns sunny after rain. At this time, there is less dust in the air and is full of small water droplets. One side of the sky is still there because it is still sunny. There are rain clouds and it is darker. There are no clouds above or behind the observer and the sun is visible, so the rainbow will be easier to see. Another place where rainbows are often seen is near waterfalls. In clear weather You can also create an artificial rainbow by sprinkling water or mist in the air with your back to the sun.