Otaku Engineer in Great Tang Dynasty

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More than a thousand years ago, Mozi conducted experiments on pinhole imaging. He clearly pointed out that light travels in a straight line, and the object formed by the small hole is like an inverted image. This is because when the light passes through the object and then passes through the small hole, due to the straight line propagation of the light, the upper part of the object is imaged down, and the lower part of the object is imaged up, so the image formed is an inverted image. He also discussed the relationship between the size of the image and the obliqueness of the object and the distance of the light source, pointing out that the object is oblique or the light source is far away, the shadow is long and thin, the object is straight or the light source is close, the shadow is short and thick, and if it is reflected light, the shadow is formed on the object. between the light source.

In addition, Mozi also conducted a fairly systematic study on plane mirrors, concave mirrors, convex mirrors, etc., and obtained a series of basic principles of geometric optics. He pointed out that what a plane mirror forms is an image of the same size, symmetrical in distance and near, but reversed from left to right. If two or more plane mirrors are irradiated opposite to each other, repeated reflections will occur, forming countless images. The imaging of the concave mirror is to form a positive image within the "middle", the image far from the "middle" is large, the image formed near the "middle" is small, and the image is as large as the object at the "middle"; Outside, an inverted image is formed, the near "middle" image is large, and the far "middle" image is small. Convex mirrors only form a positive image, with a large near image and a small far image.

The "middle" here is the spherical center of the spherical mirror. Although Mozi has not yet been able to distinguish the difference between the spherical center and the focal point and confuse the spherical center and the focal point, his conclusion is basically consistent with the imaging principle of the modern spherical mirror.

In the history of optics, Mozi was the first scientist to systematically study geometric optics. It would not be an exaggeration to say that Mozi laid the foundations of geometric optics, at least in China. As Needham said in the Physics Volume of "History of Science and Technology in China", Mozi's research on optics "is earlier than what we know of Greece", and "India can't be compared".

At this moment, when Mo Huai heard Li Zexuan's answer, he was not as surprised as the previous two times, but continued to ask: "Why is there an image of an upside-down object~? The fourth question~!"

Li Zexuan waved his hand and said with a smile: "No need, since the giant wants to hear why, then the boy will explain it well, not one of the five questions~!"

He is now more and more interested in attracting Mo Huai, so his self-proclaim has changed from being a lord at the beginning to a boy. Although he is confident of winning this game, he will give others a little face and let others lose. I am convinced that Mo Huai will teach students willingly and with all his heart in this way~! This is not called cowardice, but the demeanor of a winner~!

Li Gang frowned slightly, secretly thinking that Li Zexuan was a little too careless, but Mo Huai is also his old friend, he can't jump out at this time to stop it~?

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

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

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

At this moment, Mo Huai became very curious about Li Zexuan's origin. First of all, being able to become a martial arts master at the age of fourteen or fifteen is already a unique case in the world. However, Li Zexuan is very partial in these fields. In the realm of the world, there are still such deep accomplishments, both civil and military, and in every aspect, he can achieve an existence that is unattainable for ordinary people. Mo Huai can't imagine what kind of family, what kind of master, can teach such a monster~?

"How is it~? I wonder if the kid is right~?"

Li Zexuan's scalp felt numb from Mo Huai's eyes, so he couldn't help but say.

Mo Huai nodded silently without saying a word.

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

Hearing this, Mo Huai looked away from Li Zexuan, sighed heavily, then bowed to Li Zexuan, cupped his hands and said, "You don't have to go out, this old man admits defeat~! Li Xian's men are driven, do not ask for remuneration, work hard and bear no complaints~!"

"Uncle~! No~!"

"Uncle~! Don't~!"

Mo Zhong and Mo Yun were shocked when they saw this, and they shouted loudly.

Mo Huai is a giant of the Mo family, and his knowledge and martial arts are all the Mohists who adhere to the Mohist school. They have worshipped and pursued their role models since childhood. Today, the man who looks like a god in their eyes has actually bowed his head to a young man of fourteen or fifteen years old. How can they endure this~? Although Li Zexuan is indeed very powerful, Mo Zhong and Mo Yun still cannot accept this reality.

"Shut up~! As a Mo clan tycoon, how can this old man disbelieve his words~? Mo Zhong and Mo Yun, both of you should step down first. In the future, this old man will choose the next Mo clan tycoon~!"

Hearing the sound, Mo Huai hurriedly reprimanded him loudly, and then he cupped his hands to Li Zexuan: "Master Li, please give this old man a month of grace. After the old man returns to the Mo family's residence and picks out the next tycoon, he will go to Chang'an to be single-mindedly. Teaching students~!"

Now that Mo Huai's gentle request looks like, where is the high-spirited spirit at the beginning~? It's a bit more saddened by the end of the hero~!

Li Gang looked at it, and couldn't bear it in his heart. After all, this is an old friend he has known for many years, so he said: "Brother Mo, big brother.

It doesn't have to be this way~! Your status as a giant does not conflict with your status as a teacher at Yanhuang Academy~! Xiaoxuan is not the kind of inhumane person, he will not limit your freedom~! You can manage the affairs of the Mo family while teaching at Yanhuang Academy~! Besides, since the Mo family has declined to this day, how many affairs still need your management~? "

The corners of Li Zexuan's mouth twitched, secretly thinking that his chance was coming, and he quickly interjected: "Mr. Li is right, you go to Yanhuang Academy to teach, the boy will never limit your freedom, and the salary you should have, The kid will never lose a penny of your money~! In addition, you can move the Mo family's residence to Chang'an, tyrant~!

At that time, all the Moists of the Mo family will be settled by the kid. If there are other Moists who are proficient in mechanics, optics or mechanical equipment like you, the kid is willing to hire them to Yanhuang Academy~! As for the salary and salary of Mr. College, you must also know about the tycoon. I won't repeat it again, what do you think~? "

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