Xueba, I beg you to go and escort him quickly!

nonexistent.

Xu Heng, "Let me tell you, if I need the kind of telescope you mentioned, I have to make it myself? Why don't I just buy one?"

Yue Pingting pouted, "So...?"

Xu Heng rolled his eyes, ignored this girl, and started to draw a simple sketch on the desk.

In Xu Heng's view, this is the sketch!

But from Yue Pingting's point of view, this is a super design drawing with complicated identities!

Look more and more!

The more Yue Pingting could understand what Xu Heng's telescope would look like.

"My God! You want to make a telescope like this?"

Xu Heng, "Yeah."

Yue Pingting opened her mouth wide, "Xu Heng! Are you really going to make a telescope? Can it be successful?"

Xu Heng, "*%￥##￥......"

This girl, why is she talking nonsense!

Now that we have to do it, we must go for success!

Yue Pingting was a little confused, she always felt that this was something in physics, far away from her.

But I never expected that these were by my side.

She looked at Xu Heng's sketch, looked at the telescope above...

To be precise, it is an astronomical telescope.

"Can this one see the moon? Xu Heng?"

"This is the same as the one in our textbook, what kind of Galileo?"

Xu Heng sighed, "Practice what you have learned! Look at my sketch, and you can see that this is not a refracting telescope?"

Yue Pingting, "???"

Xu Heng gave Yue Pingting a white look, he really seemed to be feeling emotional, what a fool...

"Hey……"

He sighed seriously.

Yue Pingting knew she was wrong, so she quickly confessed, "Xu Heng, just tell me! Tell me."

Xu Heng ignored Yue Pingting, and Yue Pingting began to get tired of it.

Sticking to Xu Heng, pouted her mouth, and then... Meh.

"Good Xu Heng! Good Xu Heng! Please! Dear... Meh... Dad! Dad..."

Coincidentally, Zhou Xiu'e passed by.

"Father? What father? Xiaoyuezi, you put it downstairs."

brush!

Yue Pingting blushed immediately, and turned her back to Zhou Xiu'e, "Auntie, why are you here... I, I, you misheard me!"

Zhou Xiu'e, "That's right! You yelled so clearly, I heard it! I'll go downstairs and call you your dad."

"No, no, no! Thank you, auntie, no need! Really no need! Don't shout now!"

Yue Pingting really wanted to find a mouse hole to slip into.

Zhou Xiu'e was puzzled, "Is it really not necessary?"

Yue Pingting, "Yeah! No need! Thank you, Auntie."

Zhou Xiu'e left in doubt, "Hey... this child..."

Zhou Xiu'e left.

Yue Pingting immediately closed the door of the study.

She was all red.

She was extremely embarrassed.

Xu Heng pulled Yue Pingting into his arms and explained with a smirk, "You are talking about the Galileo telescope, but what I want to do is the Newton telescope."

"Galilean telescopes are binoculars, Newtonian telescopes are reflective telescopes."

"They basically have the same principle, they all have an objective lens, an eyepiece and a mirror."

Yue Pingting was curious, "They can all see the stars? No, they can all see the planets, can they see the moon?"

Xu Heng smiled, "Galileo used binoculars to observe the shadows cast by the moon's highlands and craters, then discovered sunspots, and also discovered the four largest moons of Jupiter."

"Science and technology have come a long way since then, with optical technology taking off and scientific instruments constantly being updated."

"Today's state-of-the-art ground-based telescopes feature bulky, flexibly rotating mirrors up to 10 meters in diameter."

Xu Heng, "Is it mentioned in the physics textbook? Galileo also discovered the rings of Saturn, sunspots, the rotation of the sun, the phenomenon of profit and loss of Venus and Mercury, the moon's diurnal and weekly libration, and that the Milky Way is composed of countless stars. etc."

"Galileo's binoculars played a big part in this."

Yue Pingting, "Since the Galileo telescope is so amazing, why don't you make a Galileo telescope, and instead make a Newtonian telescope?"

So this girl is really so ignorant!

Xu Heng shook his head, not explaining to her further.

Yue Pingting curled her lips and refused to give up, "Just tell me! Please!"

She is also curious!

She is also very fragrant to participate in!

"Wow! Wow! MUA! MUA! Wow..."

He almost kissed Xu Heng's entire face.

Zhou Xiu'e came to the study and was about to knock on the door.

The faint voice from inside startled her.

"hiss……"

"Hurry up, hurry up..."

Today's young people are a bit too much! ! !

But in fact, it was not what Zhou Xiu'e thought at all.

Under Yue Pingting's stalking, Xu Heng said, "The Newtonian telescope is a type of reflecting telescope, but it is the most widely used reflecting telescope so far!"

"At that time, Newton decided to use a spherical reflector as the primary mirror after grinding aspheric lenses many times but failed."

"The advantage of this is that the main advantage of reflecting telescopes is that there is no chromatic aberration. When the objective lens uses a paraboloid, spherical aberration can also be eliminated."

"However, in order to reduce the influence of other aberrations, the available field of view is small. The material for making the mirror only requires a small expansion coefficient, small stress and easy grinding."

"The polished reflector is generally coated with a layer of aluminum film on the surface. The reflectivity of the aluminum film in the 2000-9000 Angstrom band range is greater than 80%. Therefore, in addition to the optical band, the reflective telescope is also suitable for near-infrared and near-ultraviolet bands. research."

Xu Hengbian said that while he was popularizing science for Yue Pingting, he also pointed to his own sketches and explained to Yue Pingting...  

"The relative aperture of the reflecting telescope can be made larger, and the relative aperture of the main focus reflecting telescope is about 1/5-1/2.5, or even larger."

"In addition to the Newtonian telescope, the length of the lens barrel is much shorter than the focal length of the system, and only one surface of the primary mirror needs to be processed, which greatly reduces the cost and difficulty of manufacturing."

Only then did Yue Pingting understand.

It turned out that Xu Heng chose the Newtonian telescope because of this.

"Wait! But the things you need on your list are all common!"

"Are you sure you want to use those things as telescopes?"

"And you need to use a telescope made of some random things to observe the planet? Impossible..."

Xu Heng raised his eyebrows, "How about a bet, girl?"

Yue Pingting pouted, she thought about it carefully.

Row?

No?

Yue Pingting frowned, this time she was very serious.

Because the previous few times, she had lost completely, and she also concluded that the reason why she lost was because she didn't make it clear a few times, so she made a bet.

But this time, she won't.

She thinks she's getting smarter.

"Okay! But we have something to say first, we must see what is on the planet! Don't just see a little bit!"

Xu Heng smiled, "Okay!"

Yue Pingting said, "So, what are you betting on! Hmph!"

Xu Heng smiled even stronger, "Come on, come to my ear, and I'll tell you."

Yue Pingting stuck her head out.

Xu Heng whispered in her ear.

brush!

After a few words, Yue Pingting blushed.

"You, you...don't go too far!"

Xu Heng raised his eyebrows, "You don't have to gamble!"

Seeing Xu Heng's complacent look, Yue Pingting couldn't hold back her breath, "Just bet! Hmph!"

Xu Heng got up, intending to tell Xu Yueshan about it.

After all, the purpose of making this telescope is to pass Xu Yueshan's boring time on the one hand, and at the same time to make Xu Yueshan feel needed.

But when Xu Heng and Yue Pingting went downstairs and came to the yard.

Xu Yueshan, Zhou Xiu'e, father-in-law, and mother-in-law looked at them with strange eyes.

Xu Yueshan was even more surprised, "Why so fast?!"

What is so fast?

and many more……!

Dad, what do you mean?

Xu Heng looked at Zhou Xiu'e, "Is Dad crazy? What are you asking?"

Zhou Xiu'e covered her mouth and giggled, "It's pretty fast!"

Xu Heng, "???"

"*%￥##￥..."

Something is wrong!

You must have misunderstood something!

Yue Pingting tilted her head, looking heartless.

She doesn't feel anything.

Xu Heng, "Uh..."

"Mom and Dad, have you misunderstood something?"

Xu Yueshan, "cough cough cough! No no no! Nothing, I just said it casually, hehe!"

It's obvious that something is going on when you smile!

Xu Yueshan stood up and patted Xu Heng's shoulder, "Son! You'll be fine once you get used to it! Besides, you need to practice more, just practice more!"

There is clearly something in the words!