Ang Lee put the chopsticks in the empty glass and walked down. He walked step by step in front of the many imperial grandchildren to ensure that all of them could see the straight chopsticks and the empty glass. From time to time, he took out the straight chopsticks to let everyone see more clearly.
The eight old men in charge looked arrogant and disdainful. Of course, the chopsticks were straight. How could they be bent? This was simply a waste of time and life.
After ensuring that everyone could see that the chopsticks were straight, Ang Lee returned to the podium and poured more than half of the water into the glass. Then, he put the chopsticks into the glass again. At this time, it could be seen clearly through the glass that the chopsticks were bent. The bend was quite obvious.
"Everyone, take a look again. Is this chopstick still straight?"
As Ang Lee spoke, he walked down the podium again and let everyone see the chopsticks soaked in water.
Among them, ordinary people in the future often saw this phenomenon when they were washing the dishes. However, those who came to listen to the lecture were all pampered imperial grandchildren. They didn't have the chance to wash the dishes. Of course, in addition to washing the dishes, they had various other opportunities to see this phenomenon, such as by the pool. Therefore, most of the imperial grandchildren should know that the straight chopsticks would bend after being put in water, but they didn't know why this phenomenon would happen.
"Bent, the chopsticks are bent."
No one knew who said this.
Ang Lee smiled and said, "Yes, the chopsticks I saw were also bent, but is this chopstick really bent? Take it out and let us see. "
After taking out the chopsticks, everyone saw very clearly that the chopsticks were still straight and not bent at all. However, after being put in the water again, they bent again. Ang Lee experimented many times in a row, and the result was the same. Every time, the chopsticks were bent in the water, and after being taken out, they were straight again.
Seeing the different expressions on the royal grandchildren's faces, Li An suddenly frowned and said, "The chopsticks are straight on the outside, you can all see it. But when the chopsticks are in the water, are they straight or curved? Who can tell me?"
"Bent, bent. The chopsticks were bent when they were in the water, and they were straight when they were taken out."
"The chopsticks are straight. They have always been straight. How could they be bent?"
"Hmph, it's obviously bent. The chopsticks become bent when they enter the water."
"Chopsticks are hard, but water is soft. Chopsticks cannot become soft in water, let alone bend."
"You said that chopsticks can't bend in water, so why are the chopsticks we saw curved?"
Ang Lee hadn't paid attention for a moment, and these imperial grandsons had actually started arguing. Ordinary people were already very angry, let alone these nobles.
Of course, the quarreling royal grandchildren only accounted for about a third of the total number of people. Some of them were watching the fun, some were frowning and pondering the mystery. There were also a few guys who were absent-minded, thinking about something.
At such a young age, it was unlikely that they were thinking about girls. The most likely thing they were thinking about was eating something good after school or something else.
The eight old fellows in charge of the learning area should have stepped out to stop the quarrel, but because they were lost in thought, they actually forgot their most important task.
"Chopsticks are hard. Naturally, they won't bend when they are in the water, but why do they look bent?"
A slightly younger old fellow muttered to himself with a frown.
The old fellow next to him also frowned when he heard this. He really couldn't figure out what was going on.
"Silence, silence. Everyone, listen to me."
Ang Lee personally shouted to stop the royal grandchildren from continuing to quarrel.
Perhaps the content of Ang Lee's class was more novel, or perhaps these brats wanted to know what was going on, so when Ang Lee asked for silence, these guys who were quarreling all shut up. They looked at Ang Lee curiously, wanting to know the answer to why the chopsticks were bent in the water.
Seeing that the royal grandchildren had stopped quarreling, Ang Lee smiled with satisfaction and said, "Just now, someone said that chopsticks are hard, and water is soft. Chopsticks will naturally be straight when they are in the water. Of course, they won't bend. This is without a doubt. Otherwise, why are they still straight when they are taken out? Haha! I know that there must be people who want to ask, since chopsticks are always straight, why do they look bent when they are in the water? Why is that? Does anyone know the answer? "
After saying that, he looked at the royal grandchildren and waited for their answers.
"Sir, I know."
A teenage imperial grandson stood up confidently with an arrogant expression on his face.
Suddenly, everyone's eyes looked at this royal grandson, including the eight old fellows who were in charge.
Ang Lee had seen this royal grandson before. He was the eldest son of the Sixteenth Prince, Li Meng. At first glance, he looked like a naughty boy, about 13 or 14 years old.
"Very well, Li Meng. Tell me, why is that? Why do straight chopsticks look bent when they are in the water? "
Li Meng looked at the blackboard in the distance and said loudly, "This is because of the reflection and refraction of light."
After saying that, he looked at everyone proudly.
It had to be said that this boy was really smart. The content of Ang Lee's lesson was about the refraction and reflection of light. Therefore, the reason why chopsticks bent in the water was naturally due to the refraction and reflection of light.
Ang Lee nodded with satisfaction and asked with a smile, "Li Meng, what you said is not accurate enough. Refraction and reflection of light are two different phenomena. Do you think that the chopsticks are bent because of the reflection of light or the refraction of light?"
After saying that, he looked at Li Meng expectantly.
"Well, it's reflection or refraction."
Li Meng naturally didn't understand this question, so he spoke in a shameless tone.
After hearing Li Meng's words, the rest of the people also focused on the reflection and refraction of light.
Ang Lee didn't want to keep them in suspense anymore. He smiled and said, "The phenomenon of chopsticks bending in the water is a phenomenon of refraction of light. This is one of the main topics of our lesson. So, what is the refraction of light?"
After a short pause, Ang Lee continued to explain, "Refraction of light is the phenomenon of changing the direction of light when it is shot from one substance to another. For example, the bending of chopsticks. Okay, I'll draw a picture. Look carefully."
After saying that, Ang Lee drew a picture on the blackboard. It was a chopstick inserted diagonally into the water, and the image of the chopstick bending in the water. There were also some refraction lines.
"Before looking at this picture, I want to tell you that the reason why people can see things with their eyes is because the light from the object enters their eyes, not because their eyes emit light. If a person is put in a secret room without light, then he can't see anything. Everything around him can't be seen. Also, when there is no moonlight or starlight at night, it is difficult for us to see things. Only when there is light around us can we see things. This is enough to show that the premise for people to see things is that the object emits light or the reflected light from the object enters their eyes.
Ang Lee said.
This theory was a bit too modern. Not only did the many imperial grandchildren who came to listen to the lesson feel confused, but the eight old guys who came to hold the line also felt that it was incredible. They felt that Ang Lee was talking nonsense.
"Sir, we can see the words on the book now because the light from the book enters our eyes. Why is there no light on the book at night?"
One of the imperial grandchildren asked.
Ang Lee smiled and said, "This question is very simple. During the day, there is light on the book, but this light does not come from the book itself. It is the sunlight that is reflected to the book step by step. When the sunlight shines on the ground, the ground will reflect part of the light to the walls and pillars outside. The light from the pillars will then be reflected to our room. The tables, chairs, and beams in the room will continue to reflect the light, and naturally, the light will also be reflected to the book. In this way, there is light on the book and it can enter our eyes. In this way, we can also see the contents of the book.
The imperial grandchildren frowned and pondered. They felt that Ang Lee's words seemed to be reasonable and could be completely rationalized. Even the eight old guys who were holding the line had a certain degree of agreement with Ang Lee's words.
Ang Lee struck while the iron was hot and continued, "At night, we can light candles or turn on the lights. In this way, there will be a light source. However, because the candlelight is too small and the reflected light is very weak, it is not enough to illuminate the entire room. Therefore, when we use candlelight to read at night, it will feel very dark. It is far less convenient to read during the day."
After saying this, Ang Lee began to explain the light path diagram on the blackboard. The light path diagram of the refraction of light in water and air was explained very carefully.
For example, the law of refraction of light. The refracted light, the incident light, and the normal line were in the same plane. The refracted light and the incident light were on opposite sides of the normal line. When light was shot diagonally from the air into another medium, the refracted angle was smaller than the incident angle. When light was shot diagonally from another medium into the air, the refracted angle was larger than the incident angle. The refracted angle increased as the incident angle increased. When light was shot perpendicular to the surface of the medium, the direction of propagation did not change. At this time, the incident angle and refracted angle were zero.
Because it was the first time they came into contact with the knowledge of optics, although Ang Lee's explanation was very detailed, these imperial grandchildren could not completely understand. It was estimated that he would have to explain it a few more times to deepen their impression.
Of course, there were a few imperial grandchildren who were more talented. They could actually understand the general idea when Ang Lee taught for the first time. It was really commendable.
As for the eight old fellows whose minds were filled with poems, books, and etiquette, they were confused and felt their heads hurt. Then, they simply decided not to listen.
"Everyone, who can give an example of light refraction in life?"
Ang Lee asked.
"I know. When catching fish, the fishing spear has to be a little lower. It can't be aimed directly at the fish, otherwise, it will definitely not be able to catch the fish."
An imperial grandson immediately said. It seemed that he must have harpooned a lot of fish. Otherwise, it was impossible for him to even know the little secret of harpooning fish.
Ang Lee was very happy to agree and said, "Very good, very right. You can't aim at the fish when harpooning fish. It has to be a little lower. Who else can give an example?"
"The bamboo pole used to propel the boat looks curved."
An imperial grandson answered carefully.
Ang Lee smiled and said, "That's right, but it's the same thing as putting chopsticks in water. Who can give a better example?"
"Binoculars can see very far places very clearly. This is also the refraction of light!"
An imperial grandson said.
Ang Lee nodded very happily and said happily, "That's right. Come, I'll draw a diagram of the optical path of the binoculars. Have a good look."
After that, he drew the optical path diagram of the binoculars very carefully. After drawing the optical path diagram, he also spent some time to give a detailed explanation so that these imperial grandsons could understand it clearly.
In fact, the essence of the binoculars was the magnification function. When the distant scenery entered the convex lens of the binoculars, it was refracted inwards, and the reverse extension line of the refraction was much larger than the original scenery. When the scenery in the eyes became larger, the more intuitive feeling was naturally that the scenery became closer to oneself. This was the principle of the binoculars. It was very magical.
At this moment, binoculars had been popularized in the noble class, especially in the royal class. Almost everyone had one. These imperial grandsons were naughty children. Naturally, they often played with binoculars. Naturally, they knew the characteristics of the binoculars better. Therefore, when Ang Lee explained the principle of the binoculars, they listened very carefully.
"Who can give a better example of refraction?"
Ang Lee continued to ask.
"Rainbow. There will be a rainbow after the rain. Is it also refracted?"
A very young guy guessed.
Ang Lee nodded with satisfaction and said, "Very well said. The rainbow we often see is also produced after the refraction of light. However, there's a lot to say about the rainbow. Do you know what color the sunlight is?"
"Sunlight is red."
"No, it should be white."
"Sunlight should be golden."
"Nonsense. Sunlight has no color."
When it came to the color of sunlight, these little guys argued again. This was also the atmosphere that Ang Lee liked very much.
"Haha! Sunlight is colorful. Red, orange, yellow, green, blue, purple, there are all kinds of colors. "
Ang Lee gave the answer.
"Colorful? How can it be colorful?"
The imperial grandsons refused to believe it.
"How can sunlight be colorful? Assistant Minister Li is teaching the imperial grandsons bad things!"
"Sunlight has no color, colorful? It's nonsense. "
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