After the whole sect traveled to ancient times, I led the rebellion

The lens of a concave lens is thin in the middle and thick at the edges, and is concave in shape.

This structure makes the concave lens have a divergent effect on light, that is, the light becomes more divergent after passing through the concave lens.

The imaging characteristic of a concave lens is that it forms an erect and reduced virtual image.

“No matter how far away an object is from a concave lens, its image will always be smaller than the object itself and will be on the same side of the object.”

Cheng Yu pondered the words in the textbook and felt a bit overwhelmed.

Concave lenses are mainly used to correct myopia because they can effectively diverge light and help myopic people see distant objects clearly.

Every word and sentence in the description of myopia above indirectly confirms a fact.

He seems to be nearsighted?

Cheng Yu picked up the two concave lenses that Mu Qing did not take away.

He slowly placed the concave lens in front of his eyes.

!

Are you really nearsighted?!

Cheng Yu took off the lenses with a complicated look on his face, and before Mu Qing could react, he took the initiative to speak:

"This colored glaze, no, this glass, how much is it? I'll buy it."

???

Mu Qing raised his eyes. No way, how come Cheng Yu has to buy glasses for myopia just by drawing a picture?

Mu Qing, who was confused, did not sell the lenses to Cheng Yu.

Even if Chengyu is nearsighted, the degree of myopia still needs to be measured. Normal people will see much more clearly wearing myopia glasses. Mu Qing interrupted Chengyu's strange behavior of continuing to look around with the lenses.

Rashly using glasses with inappropriate degrees will make myopia worse.

Cheng Yu, like Master Xu, looked at the taken lens with regret.

Liulifang’s positioning was to move towards the high-end market from the very beginning.

The sales volume of colored glaze is gradually decreasing nowadays, which is due to the increase of colored glaze products on the market and the frequent wars in various places.

The forces were reorganized, and many powerful people fell from the top of the pyramid.

Currently, all major forces are focusing on food and grass, and the demand for artworks with high ornamental value such as colored glaze has decreased a lot.

In fact, the development of colored glaze is not just about colored glaze utensils and ornaments.

This time, we let the adult fish make the convex lens to see whether the artificially polished lens is feasible.

Convex lenses can be used for more than just making reading glasses.

Like the microscope used in biology laboratories.

Mu Qing had long been envious of the microscope, which he could use to observe cells and teach things. In this world, the development of biology is completely inseparable from microscopes.

Needless to say, electron microscopes were out of the question before Huang County's power system was completed. Moreover, electron microscopes have delicate parts, which Mu Qing had never touched before.

Optical Microscope Mu Qing thought about it for a long time.

After all, she knows the principles and techniques.

only……

Mu Qing's hands are not skillful.

Polishing lenses is a bit too much for her.

The imaging principle of an optical microscope is to use optics to magnify objects by the combined action of the objective lens and the eyepiece.

In short, it utilizes the imaging principle of convex lens.

Common convex lens materials include glass, plastic and crystal.

A batch of glass produced by Liulichang can be used as the material for convex lenses.

Mu Qing didn’t have the ability, so he found a mature fish.

Naturally, the adult fish lived up to expectations and polished out the convex lens.

If you are mass producing eyeglass lenses.

Just the polishing of glass requires a group of craftsmen.

There are not so many people in the base at the moment, and Mu Qing is not planning to sell glasses to make money now. It may be uncertain in the second half of this year or next year.

If Anping runs out of money, he can still sell his glasses to salvage a batch of gold and silver from the dignitaries who are nearsighted or presbyopic.

Thinking of this, Mu Qing felt a little overwhelmed again.

Obviously, there are many disciples of the Mohist School in Anping, and there are also many people from the Gongshu family, but why does she always feel that there is a lack of people?

Mu Qing tapped the tip of his pen.

There are fewer people now, so there is no need to set up an eyewear factory.

The real thing is to make a microscope, as well as a telescope and so on.

It will always be useful in war.

The principle of the telescope is basically the same.

Mu Qing thought that if he had a telescope, detecting the enemy would be a piece of cake.

It would be a pity not to use convex lenses to make telescopes.

Thinking of this, Mu Qing's enthusiasm was instantly restored, and Cheng Yu, who wanted to work hard to polish a pair of myopic glasses for himself, was also full of enthusiasm.

The microscope lens is polished with two lenses: the objective lens and the eyepiece.

In order to speed up the process, Mu Qing pulled Xu Yu into it.

The development of the microscope lens was slow, and in a muddle, the telescope was ground out first.

Mu Qing held the lens in his hand with a piece of silk with a serious look on his face, fearing that it would fall to the ground.

She mounted the two lenses on top and bottom of a simple telescope.

Using a prism to invert the scene, Mu Qing tried to pick up the telescope and look into the distance. Everything within a thousand-meter field of view could be seen at a glance.

After Xu Yu took the telescope and looked at it, his face also became serious.

The adult fish looked at the newly ground lens somewhat helplessly.

"Failed again?"

Cheng Yu stared at the telescope in Mu Qing's hand with regret.

Mu Qing shook his head and motioned Cheng Yu to pick up the telescope.

The telescope in the hands of the adult fish is a Keplerian telescope.

It consists of two convex lenses.

Military telescopes, small astronomical telescopes and other professional-grade telescopes all use this structure.

However, the imaging of this structure is inverted, so a prism erecting system or a lens erecting system should be added in the middle.

Another type is the Galilean telescope.

The Galilean structure is effectively obsolete in the twenty-first century.

The moment the adult fish picked up the telescope, the weather was very clear and there was no fog blocking the view because the sun was shining brightly today.

Adult fish look at houses in the distance and can even see clods of earth inside them.

"This is incredible."

Cheng Yu was holding the telescope with an excited look on his face. These thin slices of polished glass could allow him to see objects thousands of meters away.

This telescope was actually made by him and Xu Yu.

Cheng Yu had already memorized the imaging principle of the telescope by heart. He held the telescope and looked around excitedly.

There was a slight change in Xu Yu's expression. He leaned against the window with his chest still exposed.

"With this divine weapon, the Silver Armored Soldiers may really be able to win every battle."

Xu Yu tilted his head, looked at Mu Qing and smiled.

Seeing that Xu Yu had guessed the intention of using the telescope for military purposes, Mu Qing did not hide it.

The flatter the telescope's objective lens and the more concave (or convex) the eyepiece, the greater the magnification of the telescope.

This item is perfect for scouting the enemy situation.

Cheng Yu hadn't expected this and was a little confused about the conversation between the two.

Mu Qing just smiled and said nothing.

The Mohist school has always advocated peace and opposed war. If the eldest son of the Mohist school knew that the telescope was made by a Mohist disciple (Cheng Yu) and a former Mohist disciple (Xu Yu), he would probably try his best to stop Cheng Yu from staying in Anping.

Mu Qing did not give too much explanation.

The world is already in chaos. In Mu Qing's opinion, only by fighting can there be a glimmer of hope for survival.

The Mohists' pursuit of self-preservation and so on were understandable during the heyday of the Tianchi Dynasty.

but.

These are troubled times.

Mu Qing didn't want to fight either, but she still had to protect the people close to her and the people of Anping.

Military development is urgent. Mu Qing immediately recorded the parameters of the Kepler telescope and asked Cheng Yu and Xu Yu to grind more lenses.

First, let’s prepare the telescopes needed for military use.