Taoyuan little fisherman

Chapter 693 Upper Mirage and Lower Mirage

Mirages are very, very rare sights that most people will never see once in their lifetime.

People are like this, the more unknown things are, the more they like to think about superstition.

Seeing such a scene, many elderly people on the beach just knelt down.

"This is the sea caused by divine beasts! There must be a natural disaster."

"The weather is abnormal, and the beasts are disturbing the sea. This is an ominous omen."

"God Bodhisattva, bless my family, old and young, safe."

"The end of the world has been rumored all these years, isn't it really coming?"

A few old guys panicked, but people also became worried.

All of a sudden, people on the beach panicked.

Many people post to Moments and Weibo while being afraid, and the words are full of fear.

"Look, there is a strange scene on the sea. The older generation said it was a harbinger of a catastrophe, and they don't know if it's true or not."

"Can someone explain what's going on? Scared."

"The coordinates of Yujiacun Beach, come and watch!"

"I declare in advance, this is definitely not a P picture, leave a name before the fire!"

……

Seeing that everyone was panicking, Wang Tianhui didn't want to make things big.

Rumors stop at the wise, and we must explain to everyone what is going on.

"Everyone be quiet and listen to me!"

Wang Tianhui shouted, and everyone looked at him.

"Everyone, don't panic too much. This is actually a natural phenomenon called a mirage." Wang Tianhui explained.

"I've heard of mirages, but this is the first time I've seen them."

"Mr. Wang, how did the mirage form?"

"Yes, is this real or a phantom? Is it possible that it is really a precursor to a catastrophe?"

Everyone gathered around and asked Wang Tianhui questions one after another. Everyone wanted to know what was going on. After all, it might affect their lives and the safety of their family members.

If the end of the world is really coming, let alone other things, the money in the bank must be spent quickly, or it will become a pile of waste paper.

"Don't panic, the mirage doesn't have any scary connotations. It's like wind and rain. It's a natural phenomenon that only occurs under certain circumstances. It won't cause any harm," Wang Tianhui said.

A child asked Wang Tianhui curiously: "Brother, if mom doesn't understand, just ask, what is going on with the mirage?"

Wang Tianhui patted the child's head and said: "Mirage, also known as mirage, the ancients attributed it to the mirage of the genus of Jiaolong, which exhaled to form towers and city outlines, so it got its name.

It is a natural phenomenon formed by the refraction and total reflection of light, and it is a virtual image formed by the refraction of light reflected by objects on the earth through the atmosphere.Its essence is an optical phenomenon. "

Then Wang Tianhui explained in detail: "Mirages often appear in seas and deserts, and mirages are the result of refraction of light in layers of air with different densities along a straight line.

There are many types of mirages: according to the position where it appears relative to the original object, it can be divided into upper mirage, lower mirage and side mirage; according to its symmetrical relationship with the original object, it can be divided into front mirage, side mirage, shun mirage and Anti-mirage; According to the color, it can be divided into color mirage and non-color mirage and so on. "

The child pointed to the gradually blurred mirage and said: "Then this mirage is in the sky, and it is also colorful. Is it just a colorful mirage?"

Wang Tianhui nodded, gave the child a thumbs up and said, "You are so smart, you got the answer right!"

The child jumped up happily, and asked again: "Brother, how did the mirage form?"

Wang Tianhui said: "You are too young now. I told you that you may not understand it. It involves the principle of optics. You will not understand until you grow up and learn more."

"Brother, we've learned the optics, but the teacher didn't talk about mirages, please tell us about it." A few older kids who looked like high school students asked Wang Tianhui for advice.

"Yeah, tell me, what's going on?"

Although most people don't understand what is optical or not, as long as it can be explained by science, it is not scary to them.

Wang Tianhui nodded and said: "Mirages often occur on the sea, because the air humidity within a certain range of the sea is relatively high, and the thickness is also relatively large, so that a large area of ​​water vapor forms a huge lens by accident under the movement. system.

When the temperature near the surface changes drastically, it will cause a huge difference in the density of the atmosphere, and the distant scenery will experience abnormal refraction and total reflection when the light propagates, resulting in a mirage.

In addition, the occurrence of mirage is also related to the refractive index of air layers at different heights, and the water vapor content is an important meteorological element that directly affects the refractive index.

At the same time, there is also a certain relationship with the sudden change of temperature and relative humidity.

The air near the sea surface has a higher refractive index due to the lower temperature of the sea water and the humidity of the water vapor, while the air above it has a higher temperature due to the influence of sunlight.

The refractive index of the air layer above the sea gradually decreases from bottom to top with height. Due to the discontinuity of changes in meteorological elements, the change of the refractive index of light in the air also shows discontinuity, and the light passes through the air layer with a large refractive index. When it is at the top, it is easy to form total reflection in sunny, windless or light windy weather conditions, resulting in the spectacle of mirage. "

"So it's the refraction of the lens, I understand!" The older children understood immediately.

An old man scratched his head and said, "No wonder I have never seen it in most of my life. It turns out that the conditions for its formation are quite harsh. It is because of the abnormal weather today that such a spectacle appears."

A young man also said: "Aren't these conditions all met? The weather is hot and the heat evaporates from the sea, but the sea is still cool and clear without wind, so a large natural lens is formed on the sea, and the distant The scene is refracted to the sea."

Wang Tianhui nodded: "Everyone is right, that's what happened."

The kid doesn't understand the refraction of light, but his little head is still full of various questions.

"Big brother, there is no water in the desert, why can there be mirages? Is the mirage it appears the same as the one in the sea?"

The child's mother touched the child's head in embarrassment, then looked at Wang Tianhui with a smile and said in embarrassment: "I'm sorry, Mr. Wang, our child likes to ask questions, and it's the same at home. If you understand, you must get to the bottom of it.”

Wang Tianhui smiled and waved his hands and said: "Curious children are the smartest. Since children want to know, let me tell you something. The desert environment is completely different from the sea. It can even be said to be two extremes, but mirages will appear. It's not just about humidity, it's about temperature that affects the density of the air."

(End of this chapter)