Otaku Engineer in Great Tang Dynasty

More than a thousand years ago, Mozi conducted a small hole imaging experiment. He clearly pointed out that the light travels in a straight line, and the inverted image formed by the object passing through the small hole. This is because when the light passes through the object and then passes through the small hole, due to the straight propagation of the light, the top of the object is imaged on the bottom, and the bottom of the object is imaged on the top, so the resulting image is an inverted image. He also explored the relationship between the size of the image and the obliqueness of the object and the distance of the light source. He pointed out that the oblique object or the light source would cause the shadow to be long and thin, and the object or the light source would cause the shadow to be short and thick. If it is reflected light, the shadow is formed on the object. Between and the light source.

In addition, Mozi has conducted considerable systematic research on flat mirrors, concave mirrors, convex mirrors, etc., and has derived a series of basic principles of geometric optics. He pointed out that the flat mirror formed images of the same size and symmetrical distance and near, but they were reversed. If two or more flat mirrors illuminate each other, repeated reflections will occur, forming countless images. The image of the concave mirror is to form a positive image within the "center", the image is larger from the "center", the image from the "center" is small, and at the "center" it is as large as the object; in the "center" Outside, the inverted image is formed, the near "middle" image is large, and the far "center" image is small. Convex mirrors only form upright images, with near mirror images being large and far mirror images being small.

The "center" here is the center of the spherical mirror. Although Mozi has not been able to distinguish the difference between the center of the sphere and the focus, and confused the center of the sphere with the focus, his conclusion is basically consistent with the imaging principle of modern spherical mirrors.

In the history of optics, Mo Zi was the first scientist to conduct systematic research on geometric optics. It is not too much to say that Mozi laid the foundation of geometric optics, at least in China. Just as Needham said in the physics volume of "History of Science and Technology in China", Mozi's research on optics was "earlier than what we know in Greece" and "India cannot be compared."

At this moment, when Mo Huai heard Li Zexuan’s answer, he was not as surprised as the previous two, but continued to ask: "Why are there images of inverted objects~? If Li Xiannan doesn’t want to explain, he can treat this question as an old man. The fourth question~!"

Li Zexuan waved his hand and smiled: "No need. Since the giant wants to hear why, then the kid should explain it carefully, not as one of the five questions~!"

He is now more and more eager to win over Mo Huai, so his self-proclaimed name has changed from being a nobleman to a kid. Although he is confident to win this bet, he gives others a little face and lets others lose. He is convinced, so that Mo Huai will teach the students willingly and do his best~! This is not called cowardice, but the demeanor of the winner~!

Li Gang frowned slightly, and secretly said that Li Zexuan was a little bit big, but Mo Huai was also his old friend. He couldn't jump out to stop him at this time, right?

Li Zexuan asked Xiao Anren to bring pen and ink, and then motioned to Mo Huai to come over. He was drawing the light path diagram of the small hole imaging system while slowly saying:

"Look at the giant~! This is a candle. The flame of the candle is seen as composed of many small luminous points. Each luminous point emits light in all directions. There will always be a small beam of light passing straight through the small hole. A small spot is formed behind the small hole. Therefore, every luminous point on the candle flame will form a corresponding spot on the white paper, and all the spots on the white paper form a candle flame image..."

Following Li Zexuan's recounting, Mo Huai suddenly realized that now he finally knew what was and why, but at the same time, he looked at Li Zexuan with a very strange look, as if he was watching, monster~!

At this moment, Mo Huai became very curious about Li Zexuan’s origins. First of all, being able to become a martial arts master at the age of fourteen or fifteen years old is already unique in the world. However, Li Zexuan is very partial to these. In his field, there is actually such a deep attainment, both civil and military, and in every aspect, it can reach an existence that ordinary people can't match. Mo Huai can't imagine what kind of family, what kind of gentleman, can teach such a evildoer~?

"How about? I wonder if what the kid said is right?"

Li Zexuan's scalp was numb by Mo Huai's eyes, so he couldn't help saying.

Mo Huai nodded silently, without saying a word.

Li Zexuan said: "Then ask the giant to continue to ask the fourth question~!"

Hearing this, Mo Huai looked away from Li Zexuan, sighed deeply, then bent over to Li Zexuan, arched his hands and said, "No need to go out, the old man surrender~! From now on, the old man will let this old bone go. Driven by a man in Li County, he doesn’t ask for remuneration, he works hard~!"

"Uncle~! No~!"

"Uncle~! Don't~!"

Mo Zhong and Mo Yun were shocked and shouted.

Mo Huai, as a giant of the Mo family, knowledge and martial arts are all examples of those who adhere to Mohism and worship and chase since childhood. Now, the man who looks like a **** in their eyes has bowed to a 14- or 15-year-old young man. How can this make them tolerate~? Although Li Zexuan is indeed very good ~www.ltnovel.com~, Mo Zhong and Mo Yun still cannot accept this reality.

"Shut up~! As the Mo family tycoon, how can the old man be unbelievable~? Mo Zhong and Mo Yun, you two will leave first. In the future, the old man will choose the next Mo family tycoon~!"

Mo Huai quickly reprimanded Li Zexuan loudly when he heard the sound, and then he handed over to Li Zexuan: "Lord Li, please give me a month of grace. After the old man returns to the Mo family residence and picks out the next giant, he will go to Chang'an wholeheartedly. Teaching students~!"

Now that Mo Huai's warm-spoken request looks like, how can he still have the kind of vigor that he had just started~? It's a bit more sad about the end of a hero~!

Li Gang looked at him, feeling extremely unbearable. After all, this is an old friend he has been with for many years, so he said: "Brother Mo, it doesn't have to be like this~! Your status as a giant is not the same as a teacher at Yanhuang Academy. No conflict~! Xiaoxuan is not the kind of unkind person, he will not restrict your freedom~! You can manage the affairs of the Mo family while teaching at the Yanhuang Academy~! Besides, the Mo family has declined to this day, How many more things need you to manage~?"

The corner of Li Zexuan’s mouth evoked an arc, and he secretly said that his own opportunity came, and he quickly interjected: "Mr. Li is right, you go to Yanhuang Academy to teach, the kid will never restrict your freedom, and the salary you should have, The kid will definitely not shorten you a penny~! Besides, the giant, you can move the Mo family's residence to Chang'an~!

At that time, all the ink scholars of the Mo family will be settled by the kid. If there are ink scholars who are as proficient in mechanics, optics or machinery as you, the kid is willing to hire them to the Yanhuang Academy~! As for the salary of Mr. Academy, you must know the giant, but I won’t repeat it, how do you always think about it~? "

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