Friends who have studied physics should all know this.
The refractive index of visible light varies in different environments, such as glass, air, water, etc.
These things have a unified conceptual name, which is medium.
Nowadays, as the theoretical research of optics gradually becomes standardized, many junior high school students will also understand a truth:
Light can propagate in a medium, and the propagation of light itself does not require a medium.
But don’t forget, Mavericks was in 1665, a period when optical research was still in its infancy.
Therefore, with just a few words from Xu Yun, Xiao Niu came up with the idea that seven-color light may have different effects in different media in less than half a minute. This is a completely super level performance.
True.
The current Mavericks do not know that light itself is a boson and does not need to be propagated with the help of any fermions - in this era, the top optical theory of refraction is a mathematical equivalent form deduced by Snell, and in his
No one knew it before his death.
It was not until Huygens and others reviewed his manuscript in 1678 that it was published as the famous Snell's law.
Prior to this, the equivalent equation had only been derived by Descartes in "Refraction".
And there is a very confusing matter that no one can tell the truth about, which leads to them still sharing the honor of discovering the law of refraction of light.
Therefore, although Mavericks' statement subconsciously covers the speculation that visible light cannot be transmitted through a certain 'environment', this is a completely understandable situation - to be honest, can you imagine that the previous layer has already exploded?
Then looking at the small cluster of colorful lights on the ground, Maverick suddenly thought of something.
He thought for a few seconds and asked Xu Yun:
"Fat Fish, since sunlight can be dispersed into seven beams of colored light, are these seven colored lights different lights?
Also, theoretically, these seven beams of light should be able to be recombined into one beam of white light, right?"
Xu Yun twitched the corner of his mouth. Hey, opening his mouth revealed two more fatal points.
However, at this time, he had gradually adapted to the perverted thinking ability of this patriarch, so he quickly adjusted his mentality and said:
"Sorry, Mr. Newton, I only know the answer to the last question - as long as the conditions are right, the seven-colored light can be reunited into a beam of white light."
Mavericks was already interested at this time, and his eyes rolled:
"Fat Fish, you just said that a prism can also verify the dispersion phenomenon?"
"Yes, and the effect of prisms is much better than lenses."
Maverick nodded slightly, but soon his brows wrinkled again:
"A prism... This thing is easy to find in London. You can buy it in any optical shop on the street, but here in Woolthorpe..."
Looking at the frowning Mavericks, Xu Yun took out a prism from his pocket as if by magic:
"Mr. Newton, look at what this is?"
Mavericks took it and took a look:
"Eh? Why do you have a prism?"
Xu Yun smiled and said nothing.
The price of prism pendants in later generations was so low that many people liked to buy them as keys or even necklace ornaments. Xu Yun took an optical course last semester and bought a prism pendant.
On the key ring.
More than ten minutes later.
A table about one meter in diameter, a prism and a black wooden board were placed next to the water tank.
Xu Yun then stood up the prism, adjusted the angle skillfully, and made an OK gesture towards Mavericks.
After a while.
Sure enough, a cluster of long spectra appeared on the cardboard behind the prism, and it was much clearer than the previous cluster.
Upon seeing this, Xu Yun stepped aside and deliberately did not make any expression, wanting to see what the youth version of the Patriarch could do without any prompting.
I saw Maverick walking to the table, and took a closer look at the spectrum.
Then he hesitated for a few seconds and picked up a black cardboard.
Cut out a circle on it and place it on the outside of the prism, which is the direction from which the light source comes.
A lot of sunlight was blocked by the cardboard, and only a circular beam of light came in through the small hole, and then...
A long spectrum is still formed.
Seeing this, little Newton said softly "Hey".
Not sure if it was because he wanted to talk to someone, but he suddenly looked at Xu Yun again:
"Fat Fish, have you heard of Mr. Descartes' theory?"
Xu Yun nodded and said:
"Of course I have heard of it. I visited the University of Poitiers once.
Mr. Descartes believed that the color of light comes from the medium between the luminous body and the human eye, and has nothing to do with the light source.
The color of light is not an inherent characteristic of light, and the theory of light trace transformation was also proposed."
"That's good, but look here."
Maverick held the cardboard in one hand and pointed at the projected long spectrum with the other hand:
"According to Mr. Snell's equation and Mr. Descartes's theory, after the circular beam passes through the prism, it should form a circular or elliptical light spot.
But after dispersion occurs, the colorful light forms a long spectrum...
Could it be that......
Is there something wrong with Mr. Descartes’ theory?”
After finishing speaking, Maverick thought for a while, and before Xu Yun answered, he picked up the cardboard and scissors again and made a smaller hole.
He placed the cardboard behind the first prism, so that using this round hole, he could capture any light beam in the colored light band. (Maverick originally drew this device by hand, (DOI) 10.1098/rsta.
2014.0213, handwritten by Mavericks, you can take a look if you are interested, he is really a soul painter)
Then Mavericks waved to Xu Yun and motioned for him to come forward:
"Feiyu, I'll report the data, and you'll take the records."
Xu Yun's pupils shrank slightly, knowing that the calf was swimming towards his final "net" step by step, but his expression remained unchanged:
"Okay, Mr. Newton."
This chapter is not finished yet, please click on the next page to continue reading the exciting content! Then one of them took a pen and paper, and the other began to calculate the angle.
After 20 minutes, the data of four groups and 28 times were recorded.
Different types of light have different refractive indexes in optical glass. The underlying reasons involve the relative magnetic permeability μr and the relative dielectric constant er. These two constants require the calculation of Maxwell's equations in the medium, and then establish an intuitive relationship between matter and light.
Interaction model, summarize the equation of motion through linear dissipative force, and then use the complex number method to solve its steady state, etc...
However, considering that it is not yet on the shelves and is inconvenient for PUA readers... ahem, the content is too complicated, so everyone only needs to understand the relevant conclusions from a macro perspective.
After all, there was no Maxwell’s equations in Mavericks’ era, right?
