Li An knew that no one believed that the sunlight was colored. After all, whether it was looking at the sun or through the objects that the sunlight shone on, it could be seen that the sunlight was not colored. However, Li An said that the sunlight was colored. As such, they naturally did not understand.
Of course, what Ang Lee said was true. Sunlight didn't seem to be colored, but it was because various colors of light were mixed together, and the final result was the light that they saw. As for the color of this composite light, it was really hard to say. It was most appropriate to say that it was natural light.
"Haha! I said that light was colored, but you didn't believe me because the light you see is not colored. Do you know why? It's because various colors of light are mixed together, so naturally, you can't see color. I know that you won't believe me easily, so let's do two experiments. After these two experiments are done, you will understand more. "
After Ang Lee finished speaking, he signaled his two assistants to immediately start preparing the experimental equipment to complete this very important experiment.
The first experiment was very simple. They just needed to prepare three spotlights of different colors and connect them to the power port in the lobby. At the same time, they also needed to prepare a white cardboard.
"What is he doing?"
"We just need to watch. This is the task given to us by His Majesty. We just need to do it seriously. Why should we care about what Assistant Minister Li is doing?"
"I'm worried that the imperial grandchildren will be attracted by these strange skills and won't like to learn them in the future. In that case, it will be difficult."
"That's right! These are all strange skills. Ordinary craftsmen can learn them. The imperial grandchildren are nobles. They should learn poetry, books, and etiquette. "
"The Great Tang is in dire need of these wondrous skills! This is the intention of His Majesty to let the imperial grandchildren learn these skills. But I also think that it's enough to let the excellent craftsmen of the Tang dynasty learn these skills. The imperial grandchildren are the royal family of the Tang dynasty. They won't learn these skills and go to build machines themselves! "
"Yes! These things shouldn't be learned by the imperial grandchildren. They should learn poetry, books, and etiquette. "
"This Assistant Minister Li only knows how to do these things. I heard that his cooking skills are very good. The dishes he makes are more delicious than those made by the imperial chefs in the palace. This is really … Alas! "
While Ang Lee and his assistants were preparing the experimental equipment, the eight old men whispered. Anyway, their positions were at the back of the lobby, so they were the furthest away from Ang Lee. As long as they lowered their voices, Ang Lee really couldn't hear them.
And from their words, it was clear that in their hearts, only poetry, books, and etiquette was the right way. The rest, in particular, cooking, they were not worth mentioning.. Cooking was a disgraceful skill.........
.......................................... Of course, in this era of the Great Tang, in ordinary households, cooking was truly the privilege of women. But in many restaurants and taverns, the situation was completely different. The majority of the cooks were men, or in other words, cooks. Their status was relatively low among all the occupations, and yet Li An, despite his esteemed status, often personally cooked. This left them very confused.
The equipment for the experiment was soon ready. Ang Lee first turned on a green spotlight and let it shine on the white cardboard. Then, he asked, "Look, what color is this light?"
"Green light, it's green."
All the imperial grandchildren knew that the light was green. This was too simple.
Then, Ang Lee projected the blue light on the white cardboard and continued to ask, "Look again, what color is this?"
"Blue, it's blue."
The imperial grandchildren were very obedient and answered seriously.
Ang Lee finally turned on another spotlight and continued to ask, "What color is this?"
"Red, it's red light."
The imperial grandchildren continued to answer.
Ang Lee said with great satisfaction, "You are all right. These three lights are green, blue, and red. These three lights are very clearly shown on the white cardboard. They are three big spots, red, green, and blue. But do you know what will happen when these three lights are overlapped?"
After that, he looked at the imperial grandchildren and saw their expectant faces. So, he gently adjusted the angle of the spotlight and let the three lights gradually approach one point, while keeping one up and two down.
When the three lights were partially overlapped, a magical phenomenon happened. The color of the spots where the red and green spots overlapped changed to yellow spots, the green and blue spots overlapped to cyan, and the red and blue spots overlapped to magenta. Finally, when the three lights were all overlapped, all the colors disappeared. What appeared on the white cardboard was a big bright spot. In fact, it was white light, but the cardboard was also white, so this color could not be seen.
After the three lights were completely overlapped, Ang Lee moved it a little to show all the overlapped colors just now.
"This is amazing. When different colors of light overlap, so many changes will happen. It's really interesting."
"Yes! These children usually fall asleep listening to this, but now they are all lively and energetic. Each one is more excited than the other. They are very serious in class! "
"This is not a good thing! In the future, the imperial grandchildren will love to listen to these strange skills classes, and they will be even more unwilling to learn poetry and etiquette. "
"That's true, but this is His Majesty's decree. We can't disobey it!"
"Forget it, let's take one step at a time! If the imperial grandchildren are unwilling to learn poetry and etiquette, we will just push the responsibility to Assistant Minister Li. As long as we teach seriously and have a clear conscience, it will be fine. "
The few old fellows gathered together and whispered to each other.
These young imperial grandsons stood up excitedly and even started to whisper in confusion.
Ang Lee looked at the imperial grandchildren and said loudly, "You all saw it! When different colors of light are mixed together, it becomes white. The same is true for sunlight. It is also colorful, but because all the colors of light are mixed together, you can't see the colors. However, I have a way to separate the colors of sunlight. This is also the next experiment we are going to do. It's the same principle as the rainbow. "
After that, the two assistants began to prepare for the experiment.
This experiment was very different from the previous one. The previous experiment was to combine multiple colors of light together, but this experiment was to separate the different colors of the sunlight so that people could see them very intuitively.
For this experiment, Ang Lee prepared a large triangular mirror. This experiment seemed to have been done before, but it was estimated that these imperial grandchildren had not seen it. Even if they had seen it, they could do it again to deepen their impression.
To do the triangular mirror experiment, there must be direct sunlight. Otherwise, nothing could be seen. But there was no direct sunlight in the room, and the classroom was indoors. So, they had to use a transmitting mirror.
An assistant took a flat mirror with a tripod and walked outside the room. Then, using the reflection principle of the mirror, the sunlight was projected into the room through the window of the room. It was aimed at the position where Ang Lee needed to do the experiment, and then the reflecting mirror was fixed.
Ang Lee saw that the sunlight had been reflected on his body, so he immediately picked up the triangular mirror and placed it in the position where the light passed through. Suddenly, a magical phenomenon was launched. On the white cardboard behind Ang Lee, there was a rainbow-like light. It was very beautiful and very beautiful.
When the imperial grandchildren saw such a scene, they stood up with great interest and whispered in a low voice. It was obvious that they wanted to know the reason.
It was the first time for the eight old guys to see such an experiment. When they were experimenting many years ago, they only heard about it, but they had never seen it with their own eyes. This magical phenomenon surprised them greatly.
A seemingly inconspicuous triangular mirror could actually artificially create a rainbow. This was really too surprising. This made everyone shocked.
Ang Lee struck while the iron was hot and said, "Through these two experiments, we can already see that the sunlight is colorful. It's just that when they are mixed together, it becomes what we see. But as long as you use a triangular mirror, you can show the true color of the sunlight. Do you know why?"
After that, he looked at the imperial grandchildren.
"Because this is the refraction of light."
An imperial grandson said.
Ang Lee nodded happily and said, "That's right. This is because different colors of light have different refraction angles. So, after passing through the triangular mirror, it will appear in different positions. In this way, we see a rainbow. This is an artificial rainbow. So, when you see a rainbow in the future, don't feel strange. It's because of the refraction of light."
"Sir, rainbows appear after the rain. Why does the sunlight only appear after the rain? Is there such a triangular mirror in the sky after the rain? "
An imperial grandson asked very doubtfully. It was obvious that he used his brain.
Ang Lee smiled and said, "Your question is very good. Rainbows appear after the rain. Usually, they don't appear because after the rain, there is still some water vapor in the sky, which is small water droplets. When the sunlight passes through these small water droplets, it will be refracted, thus showing the true color of the sunlight, which is what we see as a rainbow. But these small water droplets will soon be dried by the sun, so the rainbow won't last very long and will completely disappear soon. Now you understand! Don't say that you were born with a triangular mirror, haha! "
"Hahaha!"
The imperial grandchildren who were listening to the class all laughed. This atmosphere was incomparable to other classes. It could be seen that the content of Ang Lee's class was very interesting, and the imperial grandchildren liked it very much.
Then, Ang Lee carefully drew the light path of the triangular mirror that refracted different colors of sunlight and patiently explained it. Although some people didn't understand it very well, it would be effective if he explained it a few times.
After explaining the refraction of light, Ang Lee gave the imperial grandchildren 15 minutes to digest and absorb this part of the knowledge. If there was something they didn't understand, they could ask at any time. Ang Lee would naturally explain it again seriously. These imperial grandchildren weren't fools. As long as they were taught seriously, it was impossible that they couldn't understand it, as long as they believed in themselves.
"Seniors, is my lecture okay?"
During this time, Ang Lee walked to the back of the hall and chatted with the eight old guys.
"Assistant Minister Li's lecture is very good! It's very vivid and very attractive to the imperial grandchildren. "
"Yes! Yes! This is the only class where no one dozed off. I watched it a few times, and no one dozed off, haha! "
"After listening to Assistant Minister Li's lecture, we also benefited a lot! In the past, we often saw rainbows, but we didn't know that rainbows were formed in this way. As long as there is water vapor in the air, rainbows can be produced. I don't know if Assistant Minister Li can make a real rainbow. The rainbow seen by the triangular mirror is a straight line. Compared with the rainbow after rain, there is still a big gap. "
"Yes! Yes! According to Assistant Minister Li's lecture just now, as long as there is a lot of water vapor in the air, rainbows can be produced. It's not difficult to sprinkle some water in the sky. I don't know if we can see a rainbow! "
These old guys clearly still didn't believe it. They felt that the content of Ang Lee's lecture lacked sufficient basis, and there were many flaws in it.
However, Ang Lee was already prepared. How could he be stumped by these old guys? Either he didn't do anything, or as long as he did, these guys would be convinced.
"What's so difficult about that? Isn't it just making a real rainbow? I'll get my attendants to prepare. Everyone, please wait for a moment."
Ang Lee said very carefully, and then turned around to instruct his two assistants to immediately go and prepare.
After waiting for a moment, Ang Lee walked to the front of the podium and said, "Today's time is limited, so I can only talk about it here. As for the reflection, I'll talk about it next time. Before class, I'll take you outside to see rainbows. Although it's not raining now, we can artificially create some rain so that there are small water droplets in the air. That way, we can see rainbows. Let's go, what are we waiting for?
Let's go outside and see rainbows. "After speaking, Ang Lee left the classroom with dozens of imperial grandchildren and went outside to see rainbows in the courtyard.
Seeing Ang Lee like this, the eight old guys naturally didn't dare to ask more. They could only follow him out, wanting to see how Ang Lee artificially created rainbows.
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