Otaku Engineer in Great Tang Dynasty

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In the early days of optics, the interpretation of color was particularly difficult. Before Newton, Europeans' perception of color was popular with Aristotle's point of view. Aristotle believed that color is not an objective property of objects, but a subjective feeling of people, and the formation of all colors is the result of a proportional mixture of light and dark, white and black.

In early 1666, Newton made a triangular glass prism and used it to study the color of light. To do this, he painted the room and made a small hole in the window to let in the right amount of sunlight. He placed the prism at the entrance of the light, so that the refracted light could hit the opposite wall. Through this experiment, he got a colored light spot on the wall. The color arrangement was red, orange, yellow, green, blue, Indigo, Violet. Newton called this speck of color the spectrum.

Later generations called this experiment the dispersion experiment of light!

In 1830, the British doctor and physicist Thomas Young made a small hole in the shutter to let light through, and used a mirror to reflect the light that passed through. He then used a piece of paper about 1/30 of an inch thick to split the light into two beams down the middle. The result sees intersecting light and shadow.

This is known as Young's double-slit interference experiment, which shows that two beams of light can interfere with each other like waves. The 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 can see every day is not as simple as it seems! Light is a very wonderful substance, and if you understand its interior, you will derive a lot of amazing things!

At this moment, the curtains in the auditorium have been opened, but most people still haven't recovered. They can't understand why there are only two beams of light, but when they shine on the paper, they seem to become many beams. Li Zexuan is How did you do it?

"Master, what was that just now..."

A student couldn't help but stood up and wanted to seek the truth, but halfway through the question, he couldn't keep asking, because he felt that Li Zexuan would definitely be as prevaricious as before.

Sure enough, Li Zexuan waved his hand and said, "Let's put this aside first, and I'll take you..."

"Make a little game!"

Before the last few words could be said, all the teachers and students helped Li Zexuan to say it in unison, and the voice was so loud and so angry that Li Zexuan on the podium felt a strong resentment coming towards his face. what!

"Cough cough! So you all know it!"

Li Zexuan sweated on his forehead and said something embarrassed. 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, and when they heard that Li Zexuan had something to do, they had to run over again.

"You two hold a box each, pay attention to the line connected in the middle, don't be too far away from each other, or I won't spare you if the line is torn off!"

"Yes, yes, Chief!"

The two brothers agreed quickly, and each took a box.

"Now you two go over there and stand!"

Li Zexuan pointed to the back corner of the auditorium and said.

The two brothers followed suit.

Everyone is unclear, but there are two exceptions, that is, Li Tai and Cheng Chumo, because they have not only seen this thing before, but also played with it.

Li Zexuan took out two more iron boxes (one was a voltaic battery, the other was a telegraph), after the wires were connected, he raised his head and said, "The next little game will be more interesting, you guys. Have you ever thought that one day, two people separated by thousands of miles will be able to send messages to each other?"

Sun Zifan: "Send the letter!"

Wang Meng: "You can also pass the book by flying pigeons!"

Li Zexuan shook his head and said, "How long does it take to send a letter and pass a book with flying pigeons for a distance of thousands of miles? The two things you see today will be able to achieve instant message transmission in the future!"

"Wow~!"

"This... how is this possible?"

"Thousands of miles apart, instant messaging, isn't this a method of immortals?"

There was an uproar off the court again. It was said that they were shocked more times today than in the past, and Li Zexuan kept dying every time!

"Because the space is limited, let's do a message transmission experiment at a distance of ten meters! Next, what kind of sound the box on my side makes, what kind of sound will Mo Zhong's hand make!"

Li Zexuan opened the tin box and started sending "telegrams".

"DiDi! DiDi~! DiDi~! DiDi~!"

Two short and three long!

Almost at the same time, the iron box in Mo Zhong's hand also sounded "DiDi! Di~! Di~! Di~" two short and three long voices.

Although the students and teachers felt amazing, most people didn't quite understand it.

"Chan, how do you send the message with this beeping?"

A student stood up and asked.

"Haha, good question! This classmate, think back carefully about the voice you just heard. Is it long or short?"

The student frowned and thought for a while, then replied, "Yes, Mountain Chief!"

"Then think about it again, if I combine these long and short sounds with each other, and the different combinations correspond to a word, for example, the two short and three long sounds just now correspond to the word "Li", then can I send a message through this? what?"

As soon as the voice fell, I was shocked

Cry out!

"Wow, why didn't I think of it? This method is absolutely amazing!"

"I just don't know how far this thing can travel!"

Li Zexuan said again at this time: "According to my preliminary test, this thing can achieve mutual information transmission within 30 miles! If there is a slight improvement in the future, it is not a dream to exchange information between thousands of miles!"

"Wow, more than thirty miles? That's amazing!"

"It's amazing! It's amazing! An iron box can send a message thousands of miles!"

The auditorium is boiling again!

The older generation of academy gentlemen were all shocked and looked at each other. At this moment, they really felt that they were getting old and couldn't keep up with the times!

"Okay, let's reveal this for now, there's still a good show to come! Mo Zhong, Mo Yun, please clean up these things!"

Li Zexuan once again showed a fascinated smile and commanded.

It is impossible for him to explain the principle of the telegraph in detail now!

The students showed an expression of "as expected", but now they were too lazy to complain, so they kept silent and watched Li Zexuan's performance.

I saw Li Zexuan bring a basin of water from under the desk, and then took out a box and two tubes of colored glass, then he looked at the crowd and said with a smile: "The next moment is to witness the miracle, you will see Really out of nothing~!"

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