Every five or six days, Li An would give a lesson to the imperial grandchildren. The last lesson was about the refraction of light, but this time, the lesson was mainly about the reflection of light. The content was simpler than the previous lesson, but of course, it would also be more interesting.
This time, Ang Lee prepared a lot of experimental equipment for the class. At the same time, his two assistants would follow him. There were still opportunities for them to help.
However, when Li An arrived at the Baisun Courtyard, it was completely silent. There was not a single sound of children studying. According to the time, it should be the time for the children to study. Could it be that these old fellows had given the imperial grandchildren a holiday?
"Assistant Minister Li, His Majesty has just decreed that the imperial grandchildren will listen to your lectures in the Daming Palace instead of the Baisun Courtyard."
Just when Ang Lee was puzzled, a little eunuch hurried over. He had just gone to the R&D Center to find Ang Lee. Unfortunately, Ang Lee was not there, so he hurried back.
Hearing this, Ang Lee was slightly surprised. After a pause, he asked, "Have the imperial grandchildren all gone to the palace?"
"Yes, Assistant Minister Li. His Majesty personally sent someone to pick them up. They are just waiting for Assistant Minister Li."
The little eunuch answered respectfully.
Ang Lee nodded, got in the car, and rushed to the Daming Palace.
With the advancement of technology, the high-ranking officials of the Tang dynasty no longer traveled by horse or sedan chair. Instead, they traveled by car. Ang Lee was no exception. In addition, because there were more imperial grandchildren, they made larger cars. It was not a problem for a car to accommodate 30 to 50 people.
Last time, the class in the Baisun Courtyard was fine. Why did they move the class to the Great Ming Palace this time? Ang Lee thought about it for a while and felt that it was the Emperor himself who wanted to listen to the lectures. However, as the ruler of a country, listening to Ang Lee's lectures and treating himself as Ang Lee's student was clearly inappropriate. It would be a loss of face. However, secretly listening to Ang Lee's lectures was completely different. It could be understood as monitoring the learning of the imperial grandchildren and seeing if the imperial grandchildren were serious in class. It would be a complete loss of face.
The classroom was located in Hanliang Palace, which was close to Penglai Lake. The scenery here was better and the view was wider. Moreover, it was not far from Zichen Palace, which the Emperor often visited. As such, if the Emperor wanted to come over, it would be very convenient.
In Hanliang Hall, if one wanted to see the beautiful scenery around them, they had to go up to the second floor. However, the imperial grandchildren were here to learn, and Ang Lee was also here to give a lecture. Therefore, they could not casually go up to the second floor, and could only obediently stay on the first floor.
However, even through the windows on the first floor, they could see a lot of beautiful scenery. It was just that the range of the scenery was a little smaller.
The content of the last class made the imperial grandchildren very satisfied. Therefore, during the class this time, the imperial grandchildren were very active. When they saw Ang Lee from afar, they stood up and greeted him enthusiastically. This made Ang Lee very excited.
When he entered the main hall, Li An saw that other than the dozens of imperial grandsons, there were also two teachers in charge. Compared to the eight old men last time, there were less than three quarters of them. Other than that, there was no one else.
However, there were wing rooms on both sides of the hall. The middle was separated by a thin wooden screen. Ang Lee did not know if there was anyone behind the screen.
After the class, Ang Lee first had to prepare the various instruments for the experiment. These could be done by the two assistants.
"Students, the last class talked about the refraction of light. In this class, we will talk about the reflection of light. About the previous class, do you all understand?"
Ang Lee said.
The answers of the imperial grandchildren were strange. Some said that they understood, some said that they did not understand, and some raised questions. Some even asked Ang Lee to repeat it. Some even wanted to see a rainbow.
Ang Lee explained a little and briefly retold the refraction of light. Then, he went into the main topic and began to explain the content of this class, which was the reflection of light.
Before the lecture, the first thing to do was of course to do an experiment. Only through more intuitive experiments could the children better understand what the reflection of light was.
Ang Lee first prepared a mirror, then prepared a flashlight, which was a small tool that had just been invented. Then the experiment began.
One assistant held a flat mirror in both hands, and the other assistant held a white panel. Ang Lee held the flashlight and shone it on the mirror. Then, he gently moved the angle of the flashlight. It could be seen that the position of the light spot reflected on the whiteboard would constantly change.
Then, Ang Lee changed the angle again and put the flat mirror on the table in front of him. Then, he continued the experiment to let the imperial grandchildren see more clearly.
"Did you see clearly? The light hits the mirror from different angles, so the reflection angle is different. Now, I will draw a diagram for you to see."
Ang Lee said as he drew a light path diagram on the blackboard. Then, he explained it very carefully. Because the experiment had been done, the imperial grandchildren understood the principle of reflection after listening for a while. They also knew what the angle of incidence and the angle of reflection were. They felt very happy.
"Students, about the reflection of light, what do you usually encounter?"
After Ang Lee explained the reason, it was time to ask them.
"The room facing the north is relatively dark. As long as a reflection wall is built outside, the room facing the north will become much brighter. This is the reflection of light."
"The moon in the water can be seen at night. It is caused by the reflection of moonlight from the water surface."
The imperial grandchildren gave many examples in one breath, and what they said was correct.
Ang Lee was very happy. He praised all the imperial grandchildren who answered the questions. Then, he took out the treasures he had prepared long ago. Two periscopes that had just been made a while ago.
"Students, this is a periscope, and it can be retracted. The periscope also uses the principle of light reflection. I will draw the light path diagram later. Everyone, try the periscope first. Li Shi, you first."
Ang Lee said as he pulled Li Shi up and taught him how to use it.
A simple toy like the periscope was naturally not difficult for Li Shi. He quickly learned how to use this tool and played with it happily.
Playing in the room could not reflect the great role of the periscope. If he wanted to play with the periscope better, he had to go out and play. Therefore, Ang Lee brought a group of imperial grandchildren to the outside of Hanliang Hall.
In front of Ang Lee was a brick wall that was taller than any adult. Because of the high wall, he could not see what was going on on the other side of the high wall. With this periscope, he did not have to worry. As long as he took out the periscope, he could easily see the situation on the other side of the high wall.
Ang Lee personally held a periscope, tried to adjust the length, and saw the scenery behind the high wall. Because Hanliang Hall was close to Penglai Lake, the scenery behind the high wall was very beautiful. There were mountains, water, blooming flowers, and even a beautiful artificial rainbow.
Because the number of imperial grandchildren was relatively large, and there were only two periscopes, the imperial grandchildren could only take turns to use the periscope. Each person could only use it for a moment, and then they had to pass it to the next person.
The imperial grandchildren lined up and went to experience the fun of the periscope one by one. Many imperial grandchildren did not have enough fun, and the periscope in their hands had already been snatched by the people behind them.
Of course, in order to better see the distant scenery, the periscope also used the refraction of light in addition to the reflection of light. Otherwise, due to the distance of light transmission, the scenery seen from the periscope would be smaller than what was seen directly with the eyes. In order to better appreciate the scenery, one could adjust the internal light path diagram, so that the scenery seen by the eyes would be larger and clearer. Of course, due to the limitation of the field of vision, the larger the scenery seen, the smaller the range of the view, and the larger the range of the view, the smaller the scenery seen. This was the same principle as a magnifying glass.
Because of the time constraints, Ang Lee did not develop a periscope that could adjust the range of the scenery. He only invented a fixed periscope. The most common type.
The dozens of imperial grandchildren all tried the periscope one by one, and they were full of praise for the periscope invented by Ang Lee. They felt that the periscope was a very fun and interesting toy. In fact, they even snatched the periscope from each other in order to see the other side of the high wall. The scene was a little chaotic, and two old men were scared and quickly came out to maintain order.
Since all of the imperial grandchildren had already tried the periscope, then Ang Lee would lead them back to the room and draw the light path diagram of the periscope. After that, he would explain to them the principle of the periscope, which was the refraction of light.
"Periscope? That's quite interesting. Go and get one, I want to see it. "
Li Longji was in a room nearby. He had already seen Ang Lee's performance and felt that it was quite interesting. When everyone returned to the room, he asked the eunuch to get the periscope. He wanted to see for himself if the periscope was really that magical.
"Assistant Minister Li, wait a moment, His Majesty wants to see the periscope."
A eunuch walked over and looked at the periscope in Ang Lee's hand.
Ang Lee looked at the imperial grandchildren who had all entered the room, then looked around and asked softly, "Is His Majesty nearby?"
"That's right, His Majesty has been here for a long time. He even praised Assistant Minister Li for his good lecture."
The eunuch did not hide anything and said.
Ang Lee smiled and handed the periscope in his hand to the eunuch. Then, he walked into the room and continued with his lecture.
After Li Longji received the periscope, he tried it out and found that it was indeed a good item. He did not understand why Ang Lee was so smart. He could invent all kinds of strange things.
"I want this."
Li Longji very domineeringly took the periscope that Ang Lee had painstakingly made. After he finished speaking, he took the telescope and left.
Ang Lee continued with the lecture. He drew the model of the periscope and the internal light circuit diagram. He continued to explain all kinds of things until all the imperial grandchildren could understand.
"Alright, I've finished this lesson. Class is dismissed."
After Li An finished speaking, he asked the two assistants behind him to start packing. They put all the things they brought into the basket on their backs and brought them back, leaving only a periscope. They gave it to the eldest son of the imperial grandson, Li Shi, who was also the imperial grandson. After all, he had the highest status.
Li Shi was very lively. After he received the periscope, he ran out with a whoosh and ran to the outside of the high wall. He looked at the scenery on the other side of the high wall through the long periscope. Behind Li Shi was a large group of imperial grandchildren. They were all waiting and asking questions. They were waiting for Li Shi to pass the periscope to them after he had seen enough. There were also many imperial grandchildren who kept asking what he had seen.
"Li Huai, why don't you go play?"
Seeing that all the imperial grandchildren ran out to play with the periscope, even the two old men went out to watch the fun. Only Li Huai stayed in the room and did not leave, Ang Lee asked curiously.
Li Huai walked in front of Ang Lee and said sincerely, "My father said that he wants to thank you and let me learn science from you."
"Oh, how is your father now? Is he well?"
Ang Lee asked.
Li Huai's eyes showed a trace of happiness. He said, "Father is very good. He is much better than before. He can smile and even hugged me this morning."
"Oh, so this is the first time your father hugged you this morning?"
Ang Lee asked with a smile.
"Yes, father never hugged me in the past. Now he has become better. This is all thanks to Teacher. I will learn well."
Li Huai smiled innocently, looking very satisfied. He paused and said, "Father said that he and Teacher are very fated. When he is free, he will visit and ask for Teacher's advice."
"Oh, Prince Shou wants to visit and ask for advice. Okay, go back and tell your father that as long as he is free, he can come to my residence at any time."
Ang Lee said very warmly.
Although he didn't know what Li Mao wanted to do, as a very hospitable person, Ang Lee wouldn't reject Li Mao's request. Not only Li Mao, Ang Lee wouldn't refuse anyone who wanted to visit him.
As for Li Mao's identity, many people avoided him. Ang Lee didn't think much of it. Even if the Emperor took away Li Mao's wife, they were still father and son. Moreover, after so many years, the Emperor didn't have the intention to kill him. It was obvious that the Emperor still loved this son of his. It was just that in the whole world, there was no woman who could surpass the feeling that Yang Yuhuan gave him. And the Emperor needed this feeling very much. Therefore, he risked universal condemnation and took away his son's wife. But in the Emperor's heart, more or less, he still felt a little guilty.
The worse Prince Shou's life was, the more the Emperor felt guilty. If Prince Shou could live a better life and be healthier, the Emperor's heart would feel better. In order to take care of this son of his, he specially chose a wife who was a descendant of a famous family in the capital. It wasn't a disgrace to Li Mao.
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