Outside the garden house.
With the appearance of Little Niu, Xu Yun seemed to have 'sensed' something.
A mix of three parts guilt, three parts surprise, and four parts panic showed on his face as he hurriedly put away his glasses:
"I'm sorry, Mr. Newton, I accidentally lost track of time, now I will..."
Before he finished speaking, Little Niu interrupted him:
"What is that?"
"Ah?"
Xu Yun blinked, waved his glasses, and feigned ignorance:
"As you can see, these are glasses."
Little Niu shook his head at him and said:
"Of course, I know these are glasses, a masterpiece of Sir Bacon from the mid-13th century. My mentor, Mr. Luo Wen, has a pair of custom-made lenses at a high price.
What I'm asking is... what is that seven-colored light on the wall?"
Upon hearing this, Xu Yun displayed a perfectly timed look of relief, his acting skillfully mocking certain young male idols:
"Oh, you mean that seven-colored light, it's a phenomenon of dispersion."
"Dispersion phenomenon?"
Xu Yun nodded and explained:
"In a faraway Eastern country, there was a talented knight named Sir Han Li.
He discovered that when sunlight passes through a triangle prism, it gets refracted and dispersed into seven main colorful lights: red, orange, yellow, green, blue, indigo, and violet, calling this the dispersion phenomenon."
As soon as Xu Yun said this, Little Niu was initially stunned, and then his pupils suddenly contracted!
Friends familiar with optics should all know.
For a long time, people thought white was the purest color, and white light was the purest light.
Until the 17th century, someone used a prism to cause sunlight to disperse, unveiling the secret of colors.
And that person was...
Newton!
And coincidentally enough.
Little Niu did the prism experiment on January 14, 1666, which was only three months ago!
According to Little Niu's description in the book "Optics," his curiosity about light began in mid-June 1665.
During his research with a telescope borrowed from Stock, he suddenly discovered the colors seeping through a distorted image, which sparked his study of light.
In recent days, Little Niu tried all sorts of convex lenses of various sizes, yet still could not uncover the mystery of natural light.
Moreover, due to the problem of binomial simplification, he temporarily shelved this idea, planning to study it seriously when he had the time.
Unexpectedly.....
In Xu Yun, this visitor from the East, he witnessed such a dramatic demonstration of light dispersion, or should I say...
The truth of light?
He then took a deep breath and said to Xu Yun:
"Fat Fish, show it again.... um, I'll waive your meal fee for a day."
Seeing the fish already on the hook, Xu Yun raised a barely noticeable smile at the corner of his mouth, his hands obediently complying.
He placed the thickest edge of his glasses towards the sun, adjusting to a rather subtle angle.
A moment later.
A tiny cluster of colorful spectra once again projected onto the shaded area.
Under normal circumstances, there are two main operational methods for dispersion experiments:
One is mirrors and water, and the other is a triangle prism.
But if your glasses have a high enough prescription, the edges of the glasses can temporarily produce a dispersion effect.
Since nearsighted glasses are concave lenses, the edges are thicker, especially with high-prescription lenses, which display prism-like optical characteristics.
When light hits the lenses, the refraction rates of various color lights differ, dispersing the different colors of light from the source, and then going into your eyes, that's the rainbow.
This is also why some people see color separation when looking at the edges or contours of objects through their lenses—the theoretical basis is light dispersion.
What, you ask what the technical factor is?
Of course, it's the mismatched skills of the optician....
"Red, orange, yellow, green, blue.... this is cyan, right? Cyan, violet, oh God..."
Seeing the sunlight refract into colors through the lenses, Little Niu's lips trembled with excitement:
It was previously mentioned, Little Niu is a firm believer, thus he believes there must be certain codes left by the Creator, revealing the truth of the world within all things.
And the seven-colored light through dispersion... clearly fits this condition.
He then suddenly turned his head, staring fixedly at Xu Yun:
"Fat Fish, did Sir Han Li provide any explanation for this phenomenon?"
Xu Yun opened his mouth, ready to explain the ins and outs of the dispersion phenomenon but found no matter what, he couldn't make a sound.
Meanwhile, a prompt box suddenly appeared again in front of him.
There was no text on the prompt box, only a flashing yellow exclamation mark.
It was clear.
Due to some kind of 'rule', Xu Yun's spoilers for Little Niu were restricted to a certain range, or rather, Xu had to take it step by step.
But thinking about it carefully, this was quite normal.
Otherwise, if Xu Yun directly told Little Niu F=-(GMm/r^3) r vector form, wouldn't it be over?
So Xu Yun pondered for a moment and said:
"Mr. Newton, Sir Han Li only discovered the dispersion phenomenon of light, but didn't offer much explanation of its principle.
After all, it was just an insignificant discovery in his magnificent life.
Later, Sir Han Li mysteriously disappeared during an adventure, leaving no trace.
However, before he disappeared, the knight had mentioned a sentence related to the dispersion phenomenon."
Little Niu immediately became interested, pressing on:
"What did he say?"
Xu Yun paused for a few seconds, tentatively saying:
"He said... according to his speculation, the main reason why sunlight undergoes dispersion is possibly due to the different characteristics of each color of light itself.
Just like a school of fish made up of countless fish, which appears as a large group to the naked eye, the quantity unknown.
But if different aperture nets are used for filtering, we can separate big fish from small fish.
If more nets are set, we can separate even more different sized fish or fry.
The dispersion of light might be akin to this.
Maybe their 'sizes' differ, so they display colorful rays after passing through some unknown filter."
Little Niu nodding thoughtfully, pondered for more than ten seconds, and said:
"I seem to understand, but Fat Fish, I have a question for you."
"What question?"
Little Niu lifted his eyelids and gave him a look, saying:
"According to you, a school of fish may contain big fish or fry, which belongs to the category issue within the framework of fish.
But for the fish school to survive, there must be a suitable external water source environment, right?
Like in the sea, lakes, rivers, etc., but clearly not on land or sky.
Doesn't that mean...
The propagation of light actually requires a certain environment or condition?"
Xu Yun: "...."
Demon Spirit, I want to report, someone is cheating here!