"Before that, I want to tell you a truth. A convex lens can gather light, while a concave lens can disperse the light." Han Du picked up the bottle and gestured in front of everyone, and said: "When this bottle is empty,
It cannot gather light because it is not a convex lens yet."
After saying that, he placed the empty bottle on top of a pile of hay, but no matter how Handu adjusted the distance between the bottle and the hay up or down, no light spots appeared on the hay.
"But as long as you fill it with water, it will become a convex lens, which can concentrate the sunlight." As he said this, Han Du filled the bottle with water, then placed the bottle on top of the hay again, and slowly adjusted it.
After a short distance, a bright light spot appeared on the hay.
Han Du kept his distance, and soon the dry grass began to smoke, and after a while, flames appeared and burned.
"The temperature of the light gathered in this way is very high, enough to ignite easily flammable things such as hay." ??
Lao Zhu squatted down next to Han Du, reached out to take the bottle, and asked: "So, starting a fire like this actually has nothing to do with water?"
Han Du nodded and said: "Yes, as long as it is a convex lens, it can be enlarged to collect sunlight and ignite the flame. A convex lens made of glass can also be used."
After saying that, Han Du took out another convex lens and handed it to Lao Zhu.
After Lao Zhu took it, he followed Han Du's example and adjusted the distance. Suddenly a small light spot appeared on the ground. He kept it still, and a dead leaf that the light spot hit soon started to smoke.
.It was just because there were too few dead leaves that it didn’t burn.
Han Du diligently grabbed a handful of hay from the ground and placed it under the convex lens, and soon a flame burst out and burned.
Lao Zhu stood together holding the convex lens and said with a sigh: "There are so many wonders in the world. Who would have thought that a piece of glass can light a fire?"
Later, Lao Zhu asked again: "Which branch of knowledge is this considered in mathematics, physics and chemistry?"
Han Du smiled and said: "Physics is a small branch of optics."
"What about cement?" Lao Zhu asked again.
"Chemistry is a branch of inorganic chemistry." Han Du said truthfully.
Lao Zhu nodded, naturally put the convex lens into his arms, patted Han Du on the shoulder, and praised, "Teach well, and if you need anything, just tell me directly. I just hope that you can do your best to teach them knowledge, and will
They nurture talents.”
Han Du nodded solemnly, turned his back to the student and bowed secretly to Lao Zhu.
Two days later, the academy examination was held as scheduled. On this day, the weather was also beautiful, and the sun shone brightly from early in the morning. In just three days, more than 800 Gong students signed up to take the academy examination.
Han Du cleared out the square in the back half of the academy, and it suddenly accommodated more than 800 people taking exams at the same time.
There are only two subjects in the exam, arithmetic and classic meaning. Arithmetic is just a question from various arithmetic scriptures, but it has been changed. If you are involved in arithmetic, people who can draw inferences from one example will naturally be able to answer it easily.
The title of the Classics and Meanings was given by Fang Xiaoru himself. According to his words, since he wanted him to teach the Classics and Meanings, he naturally wanted to know what level each of these Gongsheng students had in the Classics and Meanings.
The examinations in the academy are not like those in the Imperial College
The exam lasted for two days and was over in just one day.
In order to seize the time and prevent Gong students from waiting too much, the academy organized and started grading the papers that night. Han Jingyun and Mr. Jin, as well as students from the academy, were helping to mark the arithmetic papers, so they went very quickly.
On the contrary, Han Du and Fang Xiaoru's review of the classics and meanings went slower. The main reason was that Fang Xiaoru was slower. He had to carefully consider every exam paper, which naturally delayed a lot of time.
"I said Lao Fang, you can't do this." Han Du sighed helplessly.
Fang Xiaoru raised his eyes and glanced at Han Du, ignored him, and turned his attention to the examination paper in front of him.
Han Du had no choice but to shake his head and persuade: "With your attainments, you can easily tell the quality of the test paper at a glance, so why do you need to read it word by word like this?"
Fang Xiaoru disagreed with Han Du's words and said: "It's not easy for these tribute students to come all the way to the capital, and you only called 300 people into the academy. If I, as a teacher, don't look carefully, wouldn't I betray their trust?"
"But if you review like this, I'm afraid we will have to read until tomorrow. Do we still need to go to bed?" What Han Du likes most is that he can't afford to work all day long, and what he hates most is staying up late without rest.
"I'm not going to rest tonight. I'm going to review until dawn."
Han Du was so stunned by Fang Xiaoru's words that he almost lost his temper, so he logged off. After he recovered, Han Du stopped chatting with Fang Xiaoru, for fear that instead of dying of exhaustion, he would be pissed to death by him.
And since Fang Xiaoru didn't go to rest, Han Du didn't have the shame to leave him here alone and went to sleep by himself. Therefore, even if his eyes were red, Han Du could only stay with Fang Xiaoru until dawn.
On that day, the merits of more than 800 tribute students were sorted out one by one, and the academy directly announced the recruitment of 300 people.
Han Du didn't even watch the most lively announcement of results, so he went back to his room in the academy, fell down on the bed, covered his head and fell asleep.
Although the academy called for 300 people, due to various reasons, only 216 people finally entered the academy to study. The others gave up this opportunity due to various reasons.
After Han Du learned about it, he didn't care. If you don't come, just don't come. Now the academy has no real achievements, so some people don't trust it. This is normal. When the academy's achievements are revealed in the future, there will be these people
When you regret.
Not only Han Du, but also Mr. Jin and Fang Xiaoru did not express anything about this.
Han Jingyun, on the other hand, felt very unhappy about this. She felt that her mathematical attainments were enough to be the ancestor of these people. Now that she has lowered her profile to teach in person, there are still people who are unwilling?
"These blind things really piss me off." Han Jingyun's pretty face was cold, and she slapped her angry little hand on the table, which made her almost burst into tears from the pain.
Seeing this, Han Du had no choice but to comfort him: "Forget it, don't get angry with these people, it's not worth it. There are always too few smart people in this world, and there are too many fools who follow the wind. Don't you think you will do it when you meet a fool?
Want to argue with him?"
Han Jingyun felt hurt and angry, so he simply stamped his feet and turned around and left.
The academy originally recruited 300 people, but only about 200 were recruited. Naturally, the academy was not very satisfied.
But even so, there are still people who are full of prejudice and even resentment towards the academy's approach. "Before that, I want to tell you a truth. Convex lenses can gather light, while concave lenses on the contrary can disperse light." Han Du picked up the
The bottle gestured in front of everyone and said: "When this bottle is empty, it cannot gather light because it is not a convex lens yet."
After saying that, he placed the empty bottle on top of a pile of hay, but no matter how Handu adjusted the distance between the bottle and the hay up or down, no light spots appeared on the hay.
"But as long as you fill it with water, it will become a convex lens, which can concentrate the sunlight." As he said this, Han Du filled the bottle with water, then placed the bottle on top of the hay again, and slowly adjusted it.
After a short distance, a bright light spot appeared on the hay.
Han Du kept his distance, and soon the dry grass began to smoke, and after a while, flames appeared and burned.
"The temperature of the light gathered in this way is very high, enough to ignite easily flammable things such as hay."
Lao Zhu squatted down next to Han Du, reached out to take the bottle, and asked: "So, starting a fire like this actually has nothing to do with water?"
Han Du nodded and said: "Yes, as long as it is a convex lens, it can be enlarged to collect sunlight and ignite the flame. A convex lens made of glass can also be used."
After saying that, Han Du took out another convex lens and handed it to Lao Zhu.
After Lao Zhu took it, he followed Han Du's example and adjusted the distance. Suddenly a small light spot appeared on the ground. He kept it still, and a dead leaf that the light spot hit soon started to smoke.
.It was just because there were too few dead leaves that it didn’t burn.
Han Du diligently grabbed a handful of hay from the ground and placed it under the convex lens, and soon a flame burst out and burned.
Lao Zhu stood together holding the convex lens and said with a sigh: "There are so many wonders in the world. Who would have thought that a piece of glass can light a fire?"
Later, Lao Zhu asked again: "Which branch of knowledge is this considered in mathematics, physics and chemistry?"
Han Du smiled and said: "Physics is a small branch of optics."
"What about cement?" Lao Zhu asked again.
"Chemistry is a branch of inorganic chemistry." Han Du said truthfully.
Lao Zhu nodded, naturally put the convex lens into his arms, patted Han Du on the shoulder, and praised, "Teach well, and if you need anything, just tell me directly. I just hope that you can do your best to teach them knowledge, and will
They nurture talents.”
Han Du nodded solemnly, turned his back to the student and bowed secretly to Lao Zhu.
Two days later, the academy examination was held as scheduled. On this day, the weather was also beautiful, and the sun shone brightly from early in the morning. In just three days, more than 800 Gong students signed up to take the academy examination.
Han Du cleared out the square in the back half of the academy, and it suddenly accommodated more than 800 people taking exams at the same time.
There are only two subjects in the exam, arithmetic and classic meaning. Arithmetic is just a question from various arithmetic scriptures, but it has been changed. If you are involved in arithmetic, people who can draw inferences from one example will naturally be able to answer it easily.
The title of the Classics and Meanings was given by Fang Xiaoru himself. According to his words, since he wanted him to teach the Classics and Meanings, he naturally wanted to know what level each of these Gongsheng students had in the Classics and Meanings.
The examinations in the academy are not like those in the Imperial College
The exam lasted for two days and was over in just one day.
In order to seize the time and prevent Gong students from waiting too much, the academy organized and started grading the papers that night. Han Jingyun and Mr. Jin, as well as students from the academy, were helping to mark the arithmetic papers, so they went very quickly.
On the contrary, Han Du and Fang Xiaoru's review of the classics and meanings went slower. The main reason was that Fang Xiaoru was slower. He had to carefully consider every exam paper, which naturally delayed a lot of time.
"I said Lao Fang, you can't do this." Han Du sighed helplessly.
Fang Xiaoru raised his eyes and glanced at Han Du, ignored him, and turned his attention to the examination paper in front of him.
Han Du had no choice but to shake his head and persuade: "With your attainments, you can easily tell the quality of the test paper at a glance, so why do you need to read it word by word like this?"
Fang Xiaoru disagreed with Han Du's words and said: "It's not easy for these tribute students to come all the way to the capital, and you only called 300 people into the academy. If I, as a teacher, don't look carefully, wouldn't I betray their trust?"
"But if you review like this, I'm afraid we will have to read until tomorrow. Do we still need to go to bed?" What Han Du likes most is that he can't afford to work all day long, and what he hates most is staying up late without rest.
"I'm not going to rest tonight. I'm going to review until dawn."
Han Du was so stunned by Fang Xiaoru's words that he almost lost his temper, so he logged off. After he recovered, Han Du stopped chatting with Fang Xiaoru, for fear that instead of dying of exhaustion, he would be pissed to death by him.
And since Fang Xiaoru didn't go to rest, Han Du didn't have the shame to leave him here alone and went to sleep by himself. Therefore, even if his eyes were red, Han Du could only stay with Fang Xiaoru until dawn.
On that day, the merits of more than 800 tribute students were sorted out one by one, and the academy directly announced the recruitment of 300 people.
Han Du didn't even watch the most lively announcement of results, so he went back to his room in the academy, fell down on the bed, covered his head and fell asleep.
Although the academy called for 300 people, due to various reasons, only 216 people finally entered the academy to study. The others gave up this opportunity due to various reasons.
After Han Du learned about it, he didn't care. If you don't come, just don't come. Now the academy has no real achievements, so some people don't trust it. This is normal. When the academy's achievements are revealed in the future, there will be these people
When you regret.
Not only Han Du, but also Mr. Jin and Fang Xiaoru did not express anything about this.
Han Jingyun, on the other hand, felt very unhappy about this. She felt that her mathematical attainments were enough to be the ancestor of these people. Now that she has lowered her profile to teach in person, there are still people who are unwilling?
"These blind things really piss me off." Han Jingyun's pretty face was cold, and she slapped her angry little hand on the table, which made her almost burst into tears from the pain.
Seeing this, Han Du had no choice but to comfort him: "Forget it, don't get angry with these people, it's not worth it. There are always too few smart people in this world, and there are too many fools who follow the wind. Don't you think you will do it when you meet a fool?
Want to argue with him?"
Han Jingyun felt hurt and angry, so he simply stamped his feet and turned around and left.
The academy originally recruited 300 people, but only about 200 were recruited. Naturally, the academy was not very satisfied.
But even so, there are still people who are full of prejudice and even resentment towards the academy's practices.