Outside the garden house.

With the appearance of little Newton, Xu Yun seemed to have 'sensed' something.

A look of three parts embarrassment, three parts surprise, and four parts panic appeared on his face as he hurriedly put away his glasses:

"Sorry, Mr. Isaac, I accidentally forgot about the time, I'll..."

Before he could finish speaking, little Newton interrupted him:

"What is that?"

"Huh?"

Xu Yun blinked his eyes, waved his glasses, and pretended to be ignorant:

"As you can see, these are glasses."

Little Newton shook his head at him and said:

"Of course, I know these are glasses. They are the masterpiece of Sir Francis Bacon in the mid-13th century. My mentor, Mr. Rowan, has a pair of custom-made lenses.

What I'm asking is... what is that seven-colored light on the wall?"

Upon hearing this, Xu Yun's face showed a perfectly timed expression of relief, his acting skills were better than some young idols:

"Oh, you mean that seven-colored light. That is a phenomenon called dispersion."

"Dispersion?"

Xu Yun nodded and explained:

"In a distant eastern country, there was a gentleman named Han Li, who had extraordinary talent.

He discovered that when sunlight passes through a prism, it is refracted and dispersed into seven main colors of colored light, such as red, orange, yellow, green, blue, indigo, and violet. He called this phenomenon dispersion."

As soon as Xu Yun finished speaking, little Newton was first stunned, then his pupils suddenly contracted!

Friends who understand optics should know.

For a long time, people believed that white was the purest color and white light was the purest light.

It wasn't until someone used a prism in the 17th century to cause sunlight to disperse that the secret of color was revealed.

And that person was...

Newton!

And it was quite a coincidence.

Little Newton conducted his prism experiment on January 14th, 1666, just three months ago!

According to Little Newton's description in his book "Optics," his curiosity about light began in mid-June 1665.

At that time, while he was studying the telescope lent to him by Stokes, he suddenly discovered the colors that appeared in the distorted images, which led to his study of light.

In the past few days, Little Newton had tried various sizes of convex lenses but still hadn't discovered the mystery of natural light.

And because of the simplification of binomials, he temporarily put this idea aside and planned to study it when he had time.

But unexpectedly...

In the body of Xu Yun, this visitor from the East, he actually saw the dispersion of light so dramatically, or...

The truth of light?

Then he took a deep breath and said to Xu Yun:

"Fat Fish, show it to me again... um, I'll cover your meals for a day."

Seeing that the fish had taken the bait, a faint smile appeared at the corner of Xu Yun's mouth, and he obediently followed the instructions.

He adjusted the thickest edge of his glasses towards the sun and found a delicate angle.

After a moment.

A small cluster of rainbow spectra was projected onto the shadow again.

Generally speaking, there are two main ways to perform dispersion experiments:

One is with mirrors and water, and the other is with a prism.

However, if the degree of your glasses is high enough, the edge of the glasses can also temporarily achieve the effect of dispersion.

Because nearsighted glasses are concave lenses, the edges on the left and right sides are thicker, especially high-degree lenses, which have the properties of a prism.

When light shines on the lens, the refractive indices of various colors of light are different, so they disperse the various colors of light in the light source and then enter your eyes, creating a rainbow.

This is also why some people see color separation when looking at the edges or contours of objects in the edge area of the lens—the theoretical basis is the dispersion of light.

What? You're asking what the technical factors are?

Of course, it's because the optician's skills are poor...

"Red, orange, yellow, green, blue... is this cyan? Cyan, purple, oh my God..."

Seeing the sunlight refracting into a seven-colored dispersion on the lens, little Newton's excited lips trembled:

As mentioned earlier, little Newton is a devout believer, so he firmly believes that there must be some codes left by the Creator hidden in all things in the world, reflecting the truth of the world.

And the seven-colored light after dispersion... obviously meets this condition.

Then he suddenly turned his head and stared at Xu Yun:

"Fat Fish, did Sir Han Li explain this phenomenon?"

Xu Yun opened his mouth, ready to explain the cause and effect of the dispersion phenomenon, but found that he couldn't make a sound no matter what.

At the same time, a prompt box appeared in front of him again.The prompt box was devoid of any text, with only a yellow exclamation mark flashing.

Clearly.

Due to some 'rule', Xu Yun could only limit his spoilers to Little Newton within a certain range, or rather, he had to proceed gradually.

But on second thought, this was quite normal.

Otherwise, wouldn't it be over if Xu Yun directly told Little Newton the vector formula F=-(GMm/r^3）r?

So Xu Yun pondered for a moment and said:

"Mr. Isaac, Sir Han Li only discovered the phenomenon of light dispersion, but he didn't explain its principle in detail.

After all, this was just an insignificant discovery in his grand life.

Later, Sir Han Li disappeared unexpectedly during an adventure and has been missing ever since.

However, before his disappearance, the knight once mentioned something related to the dispersion phenomenon."

Little Newton immediately became interested and asked:

"What did he say?"

Xu Yun paused for a few seconds and tentatively said:

"He said... according to his guess, the dispersion of sunlight might be mainly due to the different characteristics of each color of light.

This is like a school of fish composed of countless fish. To the naked eye, it's a large, dark group, with an unknown number.

But if you filter it with different aperture nets, you can separate the big fish from the small fish.

If we set up several more filters, we can separate more sizes of fish and even fish fry.

We are "pawread dot com", find us on google.

Perhaps the dispersion of light is the same.

Maybe they are of different 'sizes', so after passing through some unknown filter, they show colorful light."

Little Newton nodded thoughtfully, pondered for a few seconds, and said:

"I think I understand, but Fat Fish, I have a question for you."

"What's the question?"

Little Newton lifted his eyelids and looked at him, saying:

"According to what you said, there might be big fish and fish fry in the school of fish, which is a category issue within the framework of fish.

But for the school of fish to survive, there must be a suitable external water source environment, right?

For example, in the sea, lakes, rivers, etc., but obviously not on land and in the sky.

Doesn't that mean...

The propagation of light also requires a certain environment, or conditions?"

Xu Yun: "......."

Damn it, I want to report, someone here is cheating!