Otaku Engineer in Great Tang Dynasty

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"Captain, so I can say that I have succeeded~? Then what you promised me at first counts!"

Hearing Li Zexuan's affirmation, Mo Lingwei immediately became excited and said quickly.

Li Zexuan said with a chuckle, "Hehe, this is still far from success! At the beginning, I said that you should build an astronomical telescope. Miss Mo, don't you think that with this little thing, you can see the moon in the sky~?"

Mo Lingwei blinked curiously and said, "Why can't it work? My clairvoyant can already see very far, can't I use it to see the moon~?"

"Of course not!"

Seeing that Yan Shaoning next to him was also puzzled, Li Zexuan had to patiently explain to them: "I told you before that the magnification of this clairvoyance is related to the ratio of the focal length of the objective lens and the eyepiece. The clairvoyance you are doing now is magnified. The magnification is at most about seven to eight times, which means that with this person looking at a distance of one hundred feet, that is, zooming in to a distance of about ten to twelve feet, and the moon is about eighty feet away from us. Eighty thousand miles, you said that with this thing, we can see what the moon looks like?"

(Usually the moon is about 400,000 kilometers away from the earth. In the Tang Dynasty, Li Shimin's double steps (one step on each left and right foot) were used as the size standard, which was called "step", and it was stipulated that three hundred steps were one mile, and one "step" was used. One-fifth of a "step" is one foot. In the Tang Dynasty, a foot is 0.303 meters, and a mile is 454 meters. The distance between the earth and the moon is equivalent to 880,000 miles in the Tang Dynasty.)

"Eighty-eight thousand miles? How far is that~?"

After the two heard it, they were speechless. Yan Shaoning thought for a while and asked, "Xiao Xuan, according to what you mean, do we just need to increase the magnification of the clairvoyant~?"

Li Zexuan pondered his chin and replied, "Yes, but it's not just a matter of increasing the magnification. When the magnification is too high, the final image formed by clairvoyance will be seriously distorted. You must find a way to reduce the problem of imaging distortion. , or the magnification is useless no matter how high it is~!"

Mo Lingwei frowned, puzzled: "Shan Chang, what is imaging distortion?"

No wonder she was ignorant, mainly because this knowledge had not been covered in the first volume of physics textbooks.

Li Zexuan organized some language and explained: "I told you about the imaging principle of convex lenses before. In fact, those are the cases where the light is close to the central optical axis, but in fact there is always a part of the light that is not close to the central optical axis, They are at the edge of the lens. Compared with the actual object, the final image of this part of the light has a certain deformation, which I call distortion!

For clairvoyance, if you want to obtain a higher magnification, the length of its overall optical path will become longer. At this time, after a small distortion passes through such a long optical system, the degree of distortion will become more Big! So when you increase the magnification of clairvoyance in the future, don't ignore the image quality! According to my experience, as long as you can guarantee a magnification of more than 30 times, you can basically meet the requirements of astronomical observation! "

Li Zexuan was very, very familiar with telescopes. When he was in high school, a buddy in his dormitory brought a telescope. It was called to see the scenery opposite the dormitory, but there were only girls' dormitories on the opposite side. In the end, the sky was full, and there was no omission. The boy's telescope was confiscated by the head teacher who suddenly checked the bed.

When he was in college, thanks to the school's geographical location, on an open day of a planetarium in the capital, he spent 35 yuan to go in and slip around. The major he studied during the period involved a considerable part of optical knowledge, and he even polished the lens himself during the internship. In the era of the Tang Dynasty, he could be called an expert in optics! This is why he can explain it to Mo Lingwei and Yan Shaoning in a straightforward manner.

"Then Xiaoxuan, how can we solve the image distortion~?"

To be honest, Yan Shaoning is not at all shocked that Li Zexuan's brain can always pop up endless sources of novel knowledge, because he has already been numb from the shock. More important than the shock is that he needs to try his best to absorb Li Zexuan. New knowledge revealed.

"This is hard!"

Li Zexuan shook his head with a complicated expression. For the imaging distortion and chromatic aberration of the lens, the method of cementing lenses is often used in modern times. By fixing more than two lenses with photosensitive adhesive, and then baking them with ultraviolet light, after two After the curing process, a set of cemented lenses can be obtained.

In some modern precision optical components, such as the objective lens of the microscope, the eyepiece of the telescope, etc., the lens groups that are glued with photosensitive glue are used. If only a simple convex or concave lens is used, it is difficult to obtain better imaging results.

However, in this era of extremely backward basic science, it is tantamount to wishing to control imaging distortion like modern optical lens companies. Next, how is it possible to make a cemented lens group!

"Although it is difficult, you can find a way to replace the simple single lens with a lens group composed of many closely spaced small lenses, and keep the overall imaging optical path unchanged! The result may be The difference~!"

After thinking for a long time, Li Zexuan could only use a dead horse as a living horse doctor in the end, said.

Yan Shaoning and Mo Lingwei both fell into contemplation.

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"Clang clang clang~!"

With a "clear" sound of gongs and drums, today's training in Yanhuang Academy finally came to an end. Qin Qiong (he was late in the morning because of the heavy rain), as the academy's military training chief instructor, decisively blew the horn.

"School~!"

Today's students are very enthusiastic about training, and there is no need to deliberately embarrass others, so Qin Qiong has a very good impression of the instructors. As soon as school is over, let the students go to school decisively without dragging their feet at all!

"Oh~! It's a holiday~!"

"Finally I can go home and sleep in~!"

"Haha~! I must eat a lot of meat these two days, Zuixianlou, this young master is here!"

The students burst into cheers, and then Yanhuang Academy became a sea of ​​joy, and cheers could be heard everywhere. The students ran back to the dormitory like a gust of wind, then rushed out of the dormitory, exited the gate of the academy, and headed directly to Chang'an City down the mountain.

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