Save the Bachelor of Heaven

Li Xiuning then took it and tried it, and was also stunned by the effect of the telescope.

"This thing can see things in the distance so clearly. If it is used on the battlefield, wouldn't it be able to find the enemy early and see through the enemy's strengths and weaknesses?" She immediately thought of the key role of this thing.

This telescope can see things several miles away clearly, so it can discover military information and enemy movements earlier, and plan and prepare earlier.

The so-called speed is the essence of war. As long as you take the initiative, you can often defeat the strong with the weak and the slow with the fast, and win the war. Therefore, this thing is not just a toy, but a powerful weapon on the battlefield.

"Kou Zhong, what kind of magic is this?" Song Yuzhi asked curiously.

"This is not a magic trick, this is the study of things to gain knowledge." Xiang Nan waved his hand and smiled, "These two lenses are convex lenses, polished with transparent crystal.

When light hits a convex lens, the light will refract and converge at one point. When it passes through another convex lens, the light will refract again, and when it enters the human eye, it will allow people to see things in the distance."

Li Xiuning and Song Yuzhi looked at each other in bewilderment, completely confused.

Seeing this, Xiang Nan asked someone to take paper and pen and make a schematic diagram of the telescope.

"The refractive index of light in different objects is different. For example, when we look at fish in the water, they are just swimming there, but when we want to catch them, we must touch the bottom of the fish to catch them." Xiang Nan explained, "This is because the refractive index of water is greater than that of air."

"I see." Li Xiuning and Song Yuzhi nodded.

Both of them have caught fish before, and they also know that when catching fish, they have to go deeper to catch fish.

But although they knew this, they didn't know the reason. After Xiang Nan said this, they finally understood.

"The refractive index of light in crystal is different from that in air. With the refraction of the convex lens, the change of light is even greater." Xiang Nan explained, "Assuming that the light is parallel, after a convex lens refraction, the light will become like this. After a second convex lens refraction, the light will become like this. In this way, looking at the distance is close."

"Kou Zhong, you are really a genius, very smart, and you can find such a thing. It's really amazing." Li Xiuning and Song Yuzhi both praised.

Everyone knows that you have to go deep to catch fish, but no one has explored the principle, but just got used to it. Unexpectedly, Xiang Nan not only found out the principle, but also made a telescope based on it.

Such intelligence is really amazing. It is indeed worthy of being taught by the gods. It is indeed a gifted talent.

"It's just so-so." Xiang Nan waved his hand and smiled, "I just like to guess."

...

"Xiuning~" At this moment, a familiar man's voice sounded.

Xiang Nan looked back and saw that it was Chai Shao.

Although he smiled and greeted Li Xiuning, his eyes were fixed on Xiang Nan, with a vigilant look.

"Chai Shao~" Li Xiuning nodded and pointed to Xiang Nan next to him, "Do you still remember Kou Zhong?"

"How could I not remember." Chai Shao nodded and smiled, "After several months of separation, Kou Shaoxia is still so simple, which is really admirable~"

He saw that Xiang Nan was still wearing linen instead of silk, so he knew that he was still a poor boy, so his face was full of contempt.

"Mr. Chai still likes to judge people by appearance." Xiang Nan also smiled,

But in fact, it was because he didn't care about his clothes, otherwise there was nothing rare about silk. Clothes made of gold thread, silver thread, and lotus root silk were just casual for him.

"Chai Shao~" Li Xiuning stopped him, not wanting Chai Shao to continue bickering with Xiang Nan.

"Oh, by the way, Xiuning, I heard that the emperor ordered you to collect heavy taxes to enrich the treasury?" Chai Shao asked.

"Yes, the court is afraid that our Li family will become too big, so we have to pay heavy taxes." Li Xiuning nodded, "But now there is war and chaos, and the people are living in poverty. We, the Li family, can't even protect the people in time, so how can we bear to increase taxes on the people. For now, we can only reduce the size of the soldiers and food and wages, and hope to unite as one to overcome the difficulties."

"In this way, the emperor will have money to expand the army, hoard food and grass, and reduce the power of the various tribes. It's really a plan to kill two birds with one stone." Xiang Nan nodded.

"Yes, there are deserters in our Li family's military camp now, and my father and brother are worried about this." Li Xiuning nodded.

It is said that soldiers eat food and eat food to serve as soldiers. In ancient times, in order to boost the morale of soldiers and enable them to fight to the death, they also needed to pay silver.

In addition, military rations, military equipment, war horses, fodder, chariots... all of them also need money. That's why there is a saying that "war is fought for money".

"Don't be afraid, Xiuning, this money is paid by our Chai family." Chai Shao saw this and said immediately.

"Really, Chai Shao?" Li Xiuning was shocked when she heard it.

This time, the Li family has to pay a heavy tax of 300,000 taels of silver, so much money is not a small amount.

"How could I lie to you, Xiuning." Chai Shao said immediately.

"How can I repay you..." Li Xiuning was very embarrassed.

"Xiuning, my feelings for you, don't you feel it?" Chai Shao looked at Li Xiuning affectionately.

Li Xiuning was a little embarrassed by his burning gaze, and couldn't help turning her head to look at Xiang Nan.

Although she knew Chai Shao's feelings for her, she didn't have any feelings for him, but she had a lot of good feelings for Xiang Nan.

"Yuzhi, the weather is nice today, let's go out for a walk." Xiang Nan said with a smile, "You must be a little bored staying in the Duke's Mansion all day."

"That's right, let's go~" Song Yuzhi nodded and smiled.

Although she is the same age as Li Xiuning and both come from aristocratic families, their personalities are completely different.

Li Xiuning has been sensible since childhood and has worked hard for her family. But Song Yuzhi is different. The Song family is in a corner and dominates Lingnan. They have no ambition to compete for the Central Plains.

And with the strength and strategy of Tiandao Song Que, it is enough to shock one side without any effort. Therefore, Song Yuzhi has been loved by her father and cared for by her brother since she was a child, and she has no worries at all.

Therefore, she does not have to worry about the family business, and naturally she is in a better mood to play.

...

At that moment, Xiang Nan and Song Yuzhi left the Duke's Mansion and strolled in Taiyuan City.

Xiang Nan has his own ideas for coaxing a lady like Song Yuzhi.

If she has seen the prosperity of the world, take her to play the carousel; if she is not experienced in the world, take her to see the prosperity of the world.

As the eldest daughter of the Song family, Song Yuzhi has naturally seen the prosperity of the world, so to give her a sense of freshness, take her to do the simplest and most romantic things.

Xiang Nan took Song Yuzhi to Jingyue Lake. The two of them rowed on the boat, chatted and fished, and then had a picnic in the woods by the lake and ate the fish they caught.

It was both wild and wild, and naturally fun.

Anyway, Song Yuzhi had a lot of fun.