More than a thousand years ago, Mo Zi had conducted an experiment on the imaging of small holes. He clearly pointed out that light traveled in a straight line, and the image formed by an object passing through a small hole was an inverted image. This was because when light passed through an object and then passed through a small hole, due to the straight line travel of light, the upper part of the object would be reflected below, and the lower part of the object would be reflected above. He also discussed the relationship between the size of the image, the object's tilt, and the distance of the light source. He pointed out that if an object was tilted or far, the shadow would be long and thin. If it was reflected light, the shadow would be formed between the object and the light source.
In addition, Mo Zi also conducted a systematic research on flat mirrors, concave mirrors, convex mirrors, and so on, and came up with a series of basic principles of geometric optics. He pointed out that flat mirrors formed images of the same size and symmetrical distance, but left and right were reversed. If two or more flat mirrors were to face each other and shine light, there would be repeated reflections, forming countless images. The image formed by a concave mirror was a positive image within the "middle", a large image if far from the "middle", a small image if near the "middle", and a large image if near the "middle". Outside the "middle", an inverted image would be formed, a large image if near the "middle", and a small image if far from the "middle". A convex mirror only formed a positive image, a large image if near the "middle", and a small image if far away.
The "middle" here was the center of the spherical mirror. Although Mo Zi had not been able to distinguish the difference between the center of the sphere and the focal point, and had confused the center of the sphere and the focal point together, his conclusion was basically consistent with the imaging principles of modern spherical mirrors.
In the history of optics, Mo Zi was the first scientist to conduct systematic research on geometric optics. It was not an exaggeration to say that Mo Zi had laid the foundation of geometric optics, at least in China. As Joseph Needham said in the physics volume of "The History of Science and Technology in China", Mo Zi's research on optics was "earlier than what we know of Greece", and "not even India".
At this moment, when Mo Huai heard Li Zexuan's answer, he was not as surprised as the previous two times. Instead, he continued to ask, "Why is there an image of an inverted object? If you don't want to explain, you can treat this as my fourth question! "
Li Zexuan waved his hand and smiled. "No need, no need. Since you want to know why, then I'll explain it to you. It's not considered one of the five questions!"
His desire to rope Mo Huai in was growing stronger and stronger. Therefore, he had changed the way he addressed himself. Although he was confident that he would win this bet, he had to give Mo Huai some face and make him accept his loss wholeheartedly. This way, Mo Huai would be willing to teach his students wholeheartedly in the future! This is not called cowardice, but the demeanor of a winner ~!
Li Gang, on the other hand, frowned slightly. He secretly thought that Li Zexuan was a little careless. However, Mo Huai was also his old friend. He couldn't possibly jump out to stop him at this time, right ~?
Li Zexuan asked Xiao An Ren to bring a brush and ink, then gestured for Mo Huai to come over. He drew the light path diagram of the small hole imaging system and said slowly,
"Juzi, please look! This is a candle. The flame of the candle can be seen as composed of many small luminous dots. Each luminous dot emits light in all directions. There will always be a small beam of light that goes straight through the small hole, forming a small luminous spot behind the small hole. Therefore, each luminous dot on the candle flame will form a corresponding luminous spot on the white paper. All the luminous spots on the white paper will form the image of the candle flame on the white paper … "
After listening to Li Zexuan's explanation, Mo Huai suddenly understood. Now, he finally knew how and why. However, at the same time, he looked at Li Zexuan very strangely, as if he was looking at a monster ~!
At this moment, Mo Huai was very curious about Li Zexuan's background. First of all, to be able to become a martial arts master at the age of 14 or 15 was already a special case in the world. However, Li Zexuan actually had such deep attainments in these very obscure fields. He was a dual cultivator of both literature and martial arts, and he could reach an existence that ordinary people could not reach in every aspect. Mo Huai could not imagine what kind of family, what kind of master, could teach such a monster ~?
"How is it ~? I wonder if this kid is right ~? "
Li Zexuan's scalp tingled under Mo Huai's gaze, so he could not help but ask.
Mo Huai nodded silently and did not say a word.
Li Zexuan said, "Then, Juzi, please continue with the fourth question ~!"
When Mo Huai heard that, he shifted his gaze away from Li Zexuan and sighed deeply. Then, he bowed to Li Zexuan and cupped his hands. "There's no need for that, this old man admits defeat ~! From now on, this old man's old bones will be at your disposal. I don't ask for any remuneration, and I will do whatever you want ~! "
"Uncle ~! No ~! "
"Uncle ~! Don't ~! "
Mo Zhong and Mo Yun were shocked when they saw this, and they shouted one after another.
As the Juzi of the Mo Family, Mo Huai's knowledge and martial arts were all the role models that they, who adhered to the Mo School, worshipped and chased after since they were young. Now, the god-like man in their eyes actually bowed to a young man of 14 or 15 years old. How could they tolerate this ~? Although Li Zexuan was indeed very powerful, Mo Zhong and Mo Yun still could not accept this reality.
"Shut up ~! As the Juzi of the Mo Family, how can I go back on my words ~? Mo Zhong, Mo Yun, the two of you can leave first. In the future, this old man will choose the next Juzi of the Mo Family ~! "
When Mo Huai heard that, he hurriedly reprimanded them loudly. Then, he cupped his hands to Li Zexuan and said, "Lord Li, please give this old man a month's time. After this old man returns to the Mo Family's encampment and chooses the next Juzi, I will return to Chang 'an to teach the students wholeheartedly ~!"
Now, Mo Huai's gentle pleading was no longer as high-spirited as he was at the beginning ~! Instead, he looked more like a hero at the end of his road ~!
Li Gang looked at him and could not bear to see this. After all, this was an old friend he had known for many years. Thus, he said, "Brother Mo, you don't have to do this ~! Your position as a Juzi does not conflict with your identity as an instructor at Yanhuang College ~! Xiao Xuan is not an unreasonable person. He will not restrict your freedom ~! You can manage the Mo Family's affairs while teaching at Yanhuang College ~! Besides, the Mo Family has declined to this day. How many affairs do you still need to manage ~? "
The corner of Li Zexuan's mouth curled up. He secretly thought that his opportunity had come. He hurriedly interjected, "Mr. Li is right. Juzi, if you go to Yanhuang College to teach, this young man will definitely not restrict your freedom. Furthermore, this young man will definitely not shortchange your salary by a single cent ~! Also, Juzi, you can move the Mo Family's encampment to Chang 'an ~!
At that time, this young man will be in charge of settling all the followers of the Mo Family. If there are any followers of the Mo Family who are proficient in mechanics, optics, or machinery like you, this young man is also willing to hire them to Yanhuang College ~! As for the salary of the teachers at the College, I'm sure you already know about it, so this young man will not repeat it. What do you think ~? "
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