In the early days of the development of optics, the interpretation of color was particularly difficult. Before Newton, the Aristotelian view of color prevailed in Europe. Aristotle believed that color was not an objective property of an object, but a subjective perception. The formation of all colors was the result of the proportional mixing of light and darkness, white and black.
At the beginning of 1666, Newton made a triangular glass prism and used it to study the color of light. For this purpose, he painted the room black and made a small hole in the window to let in the right amount of sunlight. He then placed the prism at the entrance of the light so that the refracted light could be projected to the opposite wall. Through this experiment, he obtained a colored spot on the wall. The arrangement of the colors was red, orange, yellow, green, blue, indigo, and violet. Newton called this color spot the spectrum.
Later generations called this experiment the Dispersion of Light Experiment!
In 1830, the British doctor and physicist Thomas Young made a small hole in the window to let light pass through and used a mirror to reflect the light that passed through. Then he used a piece of paper about 130 inches thick to split the light into two beams. The result was that he saw the intersecting light and shadow.
This was the famous Young's double-slit experiment, which showed that two beams of light could interfere with each other like waves. This experiment also played a crucial role in the creation of quantum science a century later.
Li Zexuan moved these two experiments to the Tang Dynasty to let the students of the academy understand that the sunlight they saw every day was not as simple as it seemed! Light was a very mysterious substance. Understanding its inner workings would give rise to many amazing things!
At this moment, the curtains in the auditorium were drawn, but most people were still in a daze. They could not understand why there were only two beams of light, but it seemed like there were many beams of light shining on the paper. How did Li Zexuan do it?
"Yamachō, how did that just …"
A student could not help but stand up to ask the truth, but halfway through, he stopped because he felt that Li Zexuan would definitely beat around the bush like before.
Sure enough, Li Zexuan waved his hand and said, "Let's put this aside first, I'll take you …"
"Let's play a little game!"
Before the last few words could be said, all the teachers and students in the audience had already helped Li Zexuan say it in unison. Moreover, their voices were so loud and so angry that Li Zexuan, who was on the podium, could only feel a strong sense of resentment rushing towards him!
"Ahem! So you all knew! "
Li Zexuan's forehead sweated and said awkwardly. Then he took out two iron boxes and shouted to the side, "Mo Zhong, Mo Yun, you two come here!"
The two brothers had already come down from the roof, but when they heard that Li Zexuan had something to do again.
"Both of you carry one box each. Pay attention to the string in the middle. Don't be too far away from each other. Otherwise, I won't forgive you if you break the string!"
"Yes, yes, yes, Yamachō!"
The Two brothers quickly agreed and each took a box.
"Now, you two stand over there!"
Li Zexuan pointed to the last corner of the auditorium and said.
The two brothers did as they were told.
Everyone was confused, but there were two exceptions: Li Tai and Cheng Chumo. Not only had they seen this thing before, but they had also played with it before.
Li Zexuan took out two more iron boxes (one contained a voltaic battery, and the other contained a telegraph). After the wires were connected, he looked up and said, "The next little game is going to be even more interesting. Have you ever thought that one day, two people thousands of miles apart will be able to send messages to each other?"
Sun Zifan: "Send a letter!"
Wang Meng: "You can also send a letter by pigeon!"
Li Zexuan shook his head and said, "How long would it take to send a letter and a pigeon over a distance of a thousand miles? The two things you see today will be able to instantly send messages across a thousand miles in the future! "
"Wow!"
"How … how is this possible?"
"Instantly sending messages across a thousand miles? Isn't this the work of an immortal?"
The audience was in an uproar again. Speaking of which, the number of times they were shocked today was more than the previous days combined. Li Zexuan was always full of surprises!
"Due to the limited space, let's first do a message transmission experiment with a distance of ten feet! Next, whatever sound my box makes, Mo Zhong's box will make the same sound! "
Li Zexuan opened the iron box and started to send the "telegraph".
"Beep, beep! Beep ~! Beep ~! Beep ~! "
Two short sounds and three long sounds!
Almost at the same time, Mo Zhong's iron box also made beeps. "Beep, beep! Beep ~! Beep ~! Beep ~ "Two short sounds and three long sounds.
Although the students and teachers felt that it was very magical, most of them could not understand it.
"Yamachō, how do we send messages with these beeps?"
A student stood up and asked.
"Haha, good question! Student, think carefully about the sounds you heard just now. Are there long and short sounds? "
That student frowned and thought for a moment before replying, "Yes, Yamachō!"
"Then think about it again. If I combine these long and short sounds with each other, and each combination corresponds to a word. For example, the two short and three long sounds correspond to the word 'Li'. Then, can I send a message through this?"
As soon as he finished speaking, exclamations of surprise rang out everywhere!
"Wow, why didn't I think of that? Yamachō's idea is really amazing! "
"I just don't know how far this thing can be transmitted!"
Li Zexuan said again, "According to my current preliminary tests, this thing can transmit messages within a distance of 15 kilometers! If it's improved in the future, it won't be a dream to transmit messages across a thousand miles! "
"Wow, more than 15 kilometers? That's amazing! "
"Amazing! Too amazing! An iron box can transmit messages across a thousand miles! "
The auditorium was once again in an uproar!
The older generation of teachers from the academy looked at each other in shock. At this moment, they really felt that they were old and could not keep up with the times!
"Okay, let's put this aside for now. There's more to come! Mo Zhong, Mo Yun, please tidy up these things! "
Li Zexuan once again revealed a mysterious smile and ordered.
It was impossible for him to explain the principle of the telegraph machine in detail now!
The students all had an "as expected" expression on their faces. However, they were too lazy to complain now, so they remained silent and watched Li Zexuan's performance quietly.
Li Zexuan brought a basin of water from under the lectern, then took out a box and two tubes of colored glass. Then, he looked at the crowd and said with a smile, "Next, it's time to witness a miracle. You will see the real meaning of making something out of nothing ~!"
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