No Regrets In Flourishing Tang

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Li An put the chopsticks in an empty glass, and then walked down, step by step in front of many Emperor’s Grandson, to ensure that all Emperor’s Grandson can see straight chopsticks and empty glasses, and sometimes put Take out the straight chopsticks to make it clearer to everyone.

The expressions of the 8 old guys sitting in the town looked clear and disdainful. Of course, the chopsticks were straight, could they not be crooked? This was a waste of time and a waste of life.

After making sure everyone sees the chopsticks straight, Li An returns to the podium, pours most of the water into the glass, and then puts the chopsticks into the glass again. At this time, the glass can be seen clearly. , The chopsticks are bent, the bend is quite obvious.

“Let’s take a look again, is this chopstick still straight?”

Li An said, walking down the podium again and let everyone watch the chopsticks soaking in the water.

Among them, the ordinary person of later generations will often see this phenomenon. When they wash the dishes, they can find that the people who come to attend the class are the precious Emperor’s Grandson. They do n’t have the opportunity to wash the dishes. Of course, apart from washing the dishes, They have various other opportunities to see this phenomenon, for example, by the pool, so most Emperor’s Grandson should know that a straight straight rod will bend after being put in the water, but why is this happening? This phenomenon, they are not quite clear.

“Bend, chopsticks bend.”

I don’t know who spoke.

Li An laughed at the corner of her mouth and said, “Yes, the chopsticks I saw are also bent, but is this chopstick really bent? Take it out and take a look.”

After taking out the chopsticks, everyone saw clearly. The chopsticks were still straight and did not bend at all. After being put in the water again, they bent again. Li An has experimented many times in succession, and the results are the same. Each time, the chopsticks bend into the water and become straight after they are taken out.

Seeing Emperor’s Grandson’s expressions are different, Li An suddenly frowns saying: “This chopstick is straight outside, you can see it, but after the chopsticks are in the water, is it straight or curved? Who will say . “

“It’s curved, it’s curved. When the chopsticks are in the water, they are curved, and when they are taken out, they are straight again.”

“Chopsticks are straight, always straight, how could it be curved.”

“Hmph, it’s obviously bent. The chopsticks become bent when they get into the water.”

“Chopsticks are hard and water is soft. When the chopsticks are in the water, they become impossible and soft, and even more impossible.”

“You said that the chopsticks can’t bend in the water, then why do we see it bent?”

Good guy, Li An is inattentive. These Emperor’s Grandsons are actually noisy. The ordinary person is very angry, not to mention these expensive people.

Of course, the quarreling Emperor’s Grandson only accounts for about one third of the total number of people, and some of them are watching the lively, there are some mysteries that frown and think about it, and there are a few more distracted guys who don’t know what they are thinking.

At such a young age, it is unlikely that girls are afraid. The most likely thing they think is that they will eat something good after school or have other concerns.

The learning venue suddenly fell into quarrels, and the eight old guys who were sitting there should have come out to stop this kind of behavior, but because they also fell into thinking for a while, they actually forgot their most important task.

“Chopsticks are hard and will not bend naturally when put in water, but why does it look curved?”

A younger Old Guy frowned to himself.

The old guy next to him listened and frowned secretly, and couldn’t figure out what was going on.

“Quiet, quiet, everyone listen to me.”

Li An shouted in person to stop Emperor’s Grandson from arguing.

Maybe Li An ’s lesson content is more novel, maybe these Brat also want to know what the situation is, so when Li An asked for silence, all the guys who were arguing shut up and looked at Li An very curiously. , Want to know the answer to the chopsticks bending in water.

Everyone at Emperor’s Grandson stopped arguing. Li An was very satisfied and laughed. He said: “Someone said just now, the chopsticks are hard, the water is soft, and the chopsticks are naturally straight in the water. Of course they will not bend. , There is no doubt about this, otherwise, why is it straight after taking it out? Haha! I know, someone must ask, since the chopsticks are always straight, why does it look like it is curved after entering the water? What? Why? Does anyone know the answer? “

After looking at the public Emperor’s Grandson, waiting for these guys to answer.

“Sir, I know.”

A teenage Emperor’s Grandson stood up very confidently, his expression quite proud.

Suddenly, everyone’s eyes looked towards this Emperor’s Grandson, including 8 sitting old guys.

Li An has seen the Emperor’s Grandson, the eldest son Li Tang of Li Lin, the 6th son of Emperor Ten. At first glance, he is a naughty kid, about 13-14 years old.

“Very good, Li Tang, why don’t you tell me? Why do the straight chopsticks bend when they get into the water.”

Li Tang looked at the blackboard in the distance, loudly said: “This is because of the reflection and refraction of light.”

After talking proudly towards everyone.

I have to say that this kid is really smart enough. The content of Li An’s class is the refraction and reflection of light. Therefore, the reason why the chopsticks bend in the water is naturally the refraction and reflection of light.

Li An was very satisfied with nodded and asked with a smile: “Li Tang, you are not accurate enough. The refraction and reflection of light are two phenomena. Do you think the chopsticks are bent, is it the reflection of light, or the refraction of light?”

After looking forward to looking towards Li Tang.

“This is reflection, or refraction.”

Li Tang couldn’t understand this question naturally, he was just talking roguely.

The rest of the people listened to Li Tang and focused their attention on reflection and refraction.

Li An does n’t want to continue to sell Guanzi anymore, laughed, opened the mouth and said: “The phenomenon that chopsticks will bend in the water is the phenomenon of light refraction. This is one of the main contents of our class. Then, what is light? What about the refraction? “

After a short pause, Li An continued to explain: “The refraction of light is a phenomenon in which the direction of propagation changes when light enters another substance, such as the bending of chopsticks. Okay, I Come draw a picture, look carefully. “

After finishing talking, Li An spent graphics on the blackboard, a chopstick inserted diagonally into the water, and an image of the chopstick bending in the water, as well as some refracted lines.

“Before looking at this graphic, I want to tell you that the reason why the human eye can see things is that the light on the object enters the human eye, not the human eye will glow. If you put a person in there In the dark room of the light, then, he ca n’t see anything, everything around him ca n’t be seen, and when there is no moonlight and starlight at night, we can hardly see things, but only when there is light around, We can only see things, which is enough to show that the premise for people to see things is that they glow or the light reflected from them enters the eyes of human beings. In this way, we can see things. Think carefully, is this the truth. “

Li An said.

This theory is a bit too trendy. Not only did the many Emperor’s Grandson who came to the class feel incomprehensible, the 8 Old Guys who came to the battle also felt incredible, and Li An was talk nonsense.

“Sir, we can now see the words on the book. The light on the book has entered our eyes. At that time, why was there no light on the book?”

An Emperor’s Grandson asked.

Li An laughed, opened the mouth and said: “This problem is very simple. During the daytime, there is light on the books, but this light is not the book itself, but the sunlight is reflected on the books step by step, and the sunlight shines on The ground, the ground will reflect part of the light to the outside walls and pillars, and the light on the pillars will reflect back to our room. The tables, chairs, and beams in the room will continue to reflect the light, and naturally will reflect the light to the In the book, so, when there is light in the book, we can enter our eyes. In this way, we can also see the content of the book, but there is no sun at night, and it is naturally black.

Emperor’s Grandson frowned, thinking that Li An said something reasonable, and he was fully able to understand the ideas. Even the eight old guys in town had some recognition of Li An’s words.

Li An hitting the iron while it was hot and continued to say: “At night, we can light the candle or turn on the light, so that there is a light source, but because the candle light is too small, the reflected light is also very weak, so it is not enough. Illuminate the whole room, so when we read books by candlelight at night, we feel that the light is very dark, which is far less convenient than reading books during the day. “

After saying this, Li An began to explain the light path diagram on the blackboard. The light path diagram of the light refracted in water and air was explained very carefully.

For example, the law of refraction of light, refracted light, the incident light and the normal are in the same plane, and the refracted light is separated from the incident light on the side of the normal 2. When light enters other media obliquely from the air, the angle of refraction is less than the angle of incidence. When entering the air obliquely from other media, the refraction angle is greater than the incident angle. The refraction angle increases with the increase of the incident angle. When the light is perpendicular to the surface of the medium, the propagation direction does not change. Is zero.

Because it is the first time to contact with the knowledge of optics, so although Li An explained very carefully, these Emperor’s Grandson can not fully understand, it is estimated to explain a few more times, so that they can deepen their impression.

Of course, there are also several Emperor’s Grandsons with relatively high aptitudes. At the time of Li An’s first class, I can understand the generals, which is really commendable.

The 8 Old Guys whose minds were watered by poetry etiquette listened to the clouds and felt their brains hurt, and then they simply stopped listening.

“Everyone, who can give examples of light refraction in life.”

Li An asked.

“I know that when catching fish, the fishing fork should go down a bit, and can not be aimed directly at the fish, otherwise it will definitely not reach the fish.”

An Emperor’s Grandson said immediately, it seems that he certainly did not go to squid, otherwise, impossible even knows this little secret of squid.

Li An acknowledged with great pleasure: “Very good. It is very correct. The fork fish can not be aimed at the fish. It must be slightly lower. Who else can give examples.”

“The bamboo pole supporting the boat looks curved.”

An Emperor’s Grandson answered carefully.

Li An said with a smile: “This is true, but this is the same thing as putting chopsticks in the water, can anyone give a better example.”

“Binoculars, you can see very far away clearly, this is also the refraction of light!”

An Emperor’s Grandson said.

Li An was very happy and nodded, and said happily: “That’s right, come, I’ll draw a telescope’s light path diagram, you take a good look.”

After I finished drawing the light path diagram of the telescope, I took it very seriously. After drawing the light path diagram, I also spent some time to give a detailed explanation so that Emperor’s Grandson can listen to these lessons.

In fact, the essence of the telescope is magnification. When the distant scene enters the convex lens of the telescope, it is refracted inward, and the reverse extension line of the refraction is much larger than the original scene, and the scene seen in the eye becomes larger Now, the more intuitive feeling is that the scene becomes closer to yourself. This is the principle of the telescope, which is very magical.

At this moment, the telescope has been popularized among the nobility class, especially the Imperial Family class, which is almost a man, and these Emperor’s Grandson are naughty children, naturally playing with the telescope often, and the nature of the telescope is naturally well understood. So, when Li An explained the principle of the telescope, they listened very seriously.

“Regarding the example of refraction, who else can give a better one.”

Li An continued to ask.

“Rainbow, there will be a rainbow after rain, is it also refracted.”

A young guy said speculatively.

Li An ’s satisfied nodded, opened the mouth and said: “It ’s very good to say that the rainbow we can often see is also produced after the light is refracted. However, there is something about the rainbow. You know that the sun is What color? “

“Sunshine is red.”

“No, it should be white.”

“Sunshine should be golden.”

“You nonsense, the sun has no color.”

When it comes to the color of sunlight, these Little Brats are arguing again, and this is the atmosphere that Li An likes very much.

“Haha! The sun is colored, red, orange, yellow, green, azure, blue, purple, whatever colors.”

Li An said the answer.

“Colored, how could it be colored.”

Emperor’s Grandson refused to believe it.

“How can the sunlight be colored, Minister Li? This is to teach Emperor’s Grandson all!”

“Daylight is colorless, color? It’s nonsense.”

The 8 old guys in town seemed disdainful, but they also had some curiosity in their hearts, and wanted to see what Li An would explain.