Upstairs of Yuhuatai Stargazing Tower.

Zhao Hao placed another chopstick in a half-full crystal cup, so that the two students understood that light could be refracted.

"When we know that light can refract and reflect, we can do a lot of things."

Zhao Hao said, taking out a convex lens specially made by the mirror polisher.

"Is this a sing?" Hua Shuyang knew exactly what he knew and pointed to the thing and said, "My father is reading books now. It can enlarge the words, but it doesn't seem to be that thick."

"The principle is the same." Zhao Hao said, aiming the magnifying glass at the sunlight, and then asked Wang Wuyang to hold a piece of rice paper and stand on the opposite side.

Zhao Hao adjusted the angle to let the sunlight pass through the lens, forming a dazzling white dot on the paper.

After a while, smoke rose from the rice paper.

Zhao Hao raised his hand and moved the focus away. The fire did not burn, leaving only a black dot on the rice paper.

The two disciples made a fuss again: "It's so convenient to light the fire like this!"

"I didn't expect that there was such a wonderful use in Xun!"

"What is this true for Master?" Eryang asked in unison again.

"It's just that it's through refraction that gathers light." Zhao Hao seemed to be talking about a trivial matter, put away the magnifying glass and said: "The heat of the sunlight also gathers to a point, and the temperature continues to rise until rice paper is lit."

"Why is the magical use of optics so?" Zhao Hao said, and took out the brass tube of hairpin carefully made by the high-speed blacksmith.

He first pointed to the lens embedded at both ends and introduced to Eryang: "This big one is an objective lens, which uses a convex lens similar to reading glasses. The small one at the other end is an eyepiece, which uses a concave lens similar to a few-flower glasses."

As he said that, he handed the copper tube to the two and said, "Put your eyes on the eyepiece and see what's going on outside."

Wang Wuyang first picked up the copper tube and put his right eye on the eyepiece. Then Zhao Hao guided him to point the objective lens out the window.

Outside the window is facing Jinling City.

"ah!"

Wang Wuyang saw it and screamed in surprise. He suddenly looked away.

If Zhao Hao hadn't been prepared, he would have to throw the copper tube to the ground.

"How could this happen?" Wang Wuyang looked pale and pointed out the window and shouted: "Jubao Gate has just rushed towards me!"

After saying that, he rubbed his eyes, looked closely, and couldn't help but wonder: "Hey, isn't this still there?"

"Let's see, let's see!" Hua Shuyang's curiosity about natural science was already stronger than Wang Wuyang. He pushed his senior brother aside, and then followed suit and looked out with a copper tube.

"Wow, Jubaomen really came to me!"

With Wang Wuyang's preparation, Hua Shuyang was not scared, but kept shouting: "Not only Jubaomen, Phoenix Platform, and Changganli have become close to me. Oh, I can see the cargo ship on the Yangtze River clearly. Hey, that person is peeing into the river..."

"I'll take a look!" Wang Wuyang felt itchy when he heard this, and he fought with Hua Shuyang and I started to fight.

"I'm not scared now?" Zhao Hao joked and said, "What should I do if the Jubao Gate hits your face?"

"Master, I was scared just now." Wang Wuyang looked at the scenery that had changed from far to near, and said awkwardly: Now that I think about it, it must be the two mirrors in this tube that brought the scene in the distance closer."

"Yes, it must have used the refraction of light!" Hua Shuyang picked up the prism and deflected the light to the wall and said, "Optics is really magical!"

Zhao Hao nodded with relief. As the legendary scholars and officials of the Ming Dynasty were indeed as good as learning and enlightened, and good at accepting new things.

But it seems normal, because just a few decades later, with missionaries such as Matteo Ricci, who spread Western science one after another, the literati of the Ming Dynasty immediately arose. Countless literati who were well-read in poetry and books, such as Xu Guangqi, Li Zhizao, Fang Yizhi, Mei Wending, Sun Yunqiu, etc., happily accepted the literati of the Thais and devoted themselves to the wave of translating and spreading Western science!

The entire Ming Dynasty had already risen to catch up, but the luck was not good, and natural disasters accidentally interrupted the process. Only then did it retreat to the ignorant era, causing the land of China to sink for three hundred years. Until four hundred years later, it was still chasing hard...

So after repeated entanglement, Zhao Hao made that decision on the glass tower.

He wanted to spread this scientific knowledge decades in advance to give the scholars and officials a little more time. See what kind of world can this Ming Dynasty give him?

Wang Wuyang and Hua Shuyang were like two children who had obtained novel toys. They kept seeing the sun set and the sky turned dark, so they reluctantly returned the copper tube to Zhao Hao.

"By the way, Master, what's the name of this thing?"

"You can give me one." Zhao Hao smiled.

"This thing can be seen from afar, but I think it's called Qianli Tong." Wang Wuyang suggested.

"I think it should be called Qianlijing." Hua Shuyang shook his head and said, "The tube is so ugly."

"Which master thinks is better?" the two looked at Zhao Hao.

"I think the telescope is good." Zhao Hao smiled and thought the original name was still good.

"Just listen to the master." Eryang had just blindly admired Zhao Hao before. At this moment, they finally clearly realized that the master's knowledge was so profound that no one could match in this world, and I am afraid that only those ancient sages could match it.

"But, Master, we have to go back quickly." Wang Wuyang looked at the sky and reminded Zhao Hao: "Otherwise, the city gate will be closed later and I will not be able to go home."

"Who said I'm going back tonight?" Zhao Hao smiled and took out a longer and larger monocular lens from the wooden box, put it on the windowsill and said, "Let's look at the moon tonight."

"It's great, Master is so elegant!" Wang Wuyang said happily when he heard this: "It seems that another famous article has been published tonight!"

Hua Shuyang also nodded vigorously. For the traditional scholars and officials, the bright moon in the sky was almost their spiritual companion.

From "looking up at the bright moon" to "sharing the beauty of the moon thousands of miles away"; from "when will the bright moon appear?" to "the moon sets, crows cry and frost are everywhere in the sky"... I don't know how many literati and poets told their thoughts to Chang'e in the Moon Palace, turning them into peerless works, nourishing the spiritual world of the Chinese people.

At this time, Gao Wu bought a simple supper. While eating sugar lotus root porridge, Zhao Hao asked the two disciples to tell Gao Wu about their knowledge about the moon.

Wang Wuyang then talked about Guanghan Palace on the moon, the osmanthus tree, Chang'e, Wu Gang and Jade Rabbit, and toad...

"The Guanghan Palace is thousands of feet high, and the jade tower is like a mountain and a sea. Fairy Chang'e lives inside, originally Houyi's wife..."

"There is still a five hundred feet tall osmanthus tree in the Moon Palace. The immortal Wu Gang held a giant axe and was cutting the osmanthus tree day after day. But as soon as the axe left, the trauma of the osmanthus tree healed immediately. Therefore, Wu Gang cuts osmanthus tree all year round, but he can't cut down this tree..."

"Then why did Wu Gang cut down trees?" After Wang Wuyang finished speaking, Gao Wu finally asked.

"This..." Wang Wuyang scratched his head and said, "I really don't know."

"I guess it was the Jade Emperor who promised him that he could sleep with Chang'e as long as he cut down the tree..." Hua Shuyang couldn't help but smile. After saying that, he remembered that his master was not yet an adult, so he quickly slapped himself in the mouth.

"I'm talking nonsense!"
Chapter completed!