Journey to the West: Life Simulation of Sun Wukong

"Speaking of invisibility, what's the first thing that comes to your mind?" Su Jie asked in return.

Chen Tian Yuzi: "Harry Potter."

"I think of a cartoon I watched in childhood: the snake talisman in 'Jackie Chan Adventures', which is pretty much the same as an invisibility cloak, both optically invisible. But the person who is invisible can see other things."

As she spoke, Zhang Manman flicked the cloak, "Unlike this one, once it takes effect, it's pitch black in front of your eyes, not a single ray of light."

The use of the invisibility cloak was also very simple.

At the collar, there was a golden clasp. Press it, and a strange fluctuation would occur, making the person disappear.

Similarly, press it again, and you would reappear.

However, Zhang Manman felt that directly pulling off the cloak or destroying it would also make the invisibility ineffective, producing an effect similar to that of the snake talisman.

Just with one more flaw.

But Jos said, "When it comes to invisibility, the first thing I associate with it is the stealth fighter jet."

Even now, when mental training and vigorous life force are widespread, if a war really erupts between countries, it will still rely on various fighter jets, missile systems, and advanced technology weapons.

After all, a single sweep with missiles and machine guns could reduce even the most bustling city to ruins in an instant.

No need for people to go to battle at all.

Of course, under the current circumstances, war is absolutely impossible to break out, as no one knows the limits of Ming Lun's few.

They were like deities, suppressing wars on Earth.

Any country that wished to launch a war had to consider deep down whether their fists were hard enough to provoke Ming Lun.

As for terrorists...

There are plenty of people with problematic minds in reality.

Ming Lun currently has cooperation with nations and international organizations, and will send appropriate teams to eradicate terrorists, which is a kind of training for students with potential in the academy.

At the same time, after completing such eradication missions, they also had to write a report, not only detailing the process but also pondering why these terrorists emerged and whether there was a problem somewhere.

What Ming Lun wanted to do was not just to have potential students eliminate bandits but also to make them see clearly, understand the fundamental issues, and prevent recurrence, rather than repeatedly cutting like harvesting leeks.

Perhaps after solving the problem, new issues would arise, but this was progress. Keep us going by reading on MV_LEM_PYR.

Ming Lun reaped leeks only once. The second time, they might harvest shallots, or maybe celery.

"Exactly, fighter jets." Su Jie, although unable to sense what exactly Jos was brainstorming about, affirmed Jos's idea, "Stealth fighter jets—are they truly invisible?"

Jos shook his head: "No, it's radar stealth, not optical invisibility. After all, for a combat aircraft on routine patrol, even if ordinary people stuffed their eyes into binoculars, they might not be able to see it, so radar stealth is sufficient."

The so-called radar stealth is just becoming undetectable on radar.

Su Jie said, "Indeed, but do you know why fighter jets don't use optical invisibility?"

Zhang Manman, who wasn't familiar with fighter jets, but quick-witted nonetheless, came up with an idea, "Because if it's just optical invisibility that the naked eye can't see, it's meaningless since you're just invisible, not gone. With such an advanced level of modern technology, there are plenty of methods to detect you."

"Just like me wearing this invisibility cloak, to an expert, it's no different than parading naked in front of him, or her."

"If it weren't for the unique environment of Ice Fire Island, this cloak wouldn't be able to achieve any surprising effect."

Even so, Zhang Manman estimated that even if the next few rounds were to occur in a harsh map like Ice Fire Island, those experts would have plenty of ways to find her.

This Supreme Cup, the further it went, the stronger the opponents became.

Just like in large-scale arena competitions.

"Correct. For modern technology, it seems that aside from looking cool, optical invisibility is useless, after all, there are various radars, infrared, ultrasonic positioning, and so on." Su Jie confirmed Zhang Manman's thoughts, then went on to talk about the concept of optical invisibility.

"The most basic level of optical invisibility is actually quite simple, like camouflage or ghillie suits."

"To blend in with the surrounding environment so that others can't notice you, that's being invisible."

"Many animals in nature do this, like stick insects disguising as branches, and chameleons changing colors."

Chen Tian Yuzi said, "Shouldn't this be considered camouflage rather than invisibility?"

Su Jie nodded, "This is indeed a bit of a trick. However, the human eye can only perceive electromagnetic waves with wavelengths between 400-700 nanometers, which are the colors visible to normal people, the visible light spectrum."

"To see an object, humans have only two methods: either the object reflects electromagnetic waves of this spectrum emitted by another source, or the object itself emits electromagnetic waves in this spectrum, becoming an emitter."

"Our Spiritual Energy sensing, in fact, is also due to electromagnetic wave transmitted information, which is a clearer way of perception than using our eyes."

"Of course, you might not be able to do it yet."

Zhang Manman: "o(￣ヘ￣o＃)"

Chen Tian Yuzi: "(⊙o⊙)..."

Jos: "Su Jie, what you said is spot on. We humans are able to see things because our eyes, as receivers, detect the wavelengths of objects, and thus form images in our brains."

"Indeed," Su Jie picks up the conversation, "in reality, there is no object that doesn't emit anything at all. After all, even outside Earth's atmosphere, with the background of the universe at extremely low temperatures, there's still 3K background radiation."

Su Jie had once seen on a science education channel, there was a person whose eyes went blind due to some reason, but his ears became exceptionally sensitive.

So, he used his mouth to make sounds and used his ears to identify obstacles...

He was literally a real-life Daredevil!

That was a science segment he watched when he was ten.

Unfortunately, that person didn't possess the incredible agility of Daredevil and would occasionally bump into obstacles.

Of course, this was just one example—

"Even if there truly was an object that didn't emit anything, we could still use various radiations to irradiate it, and it would have to reflect."

Su Jie provided a forceful scientific truth of the current era.

"Wait, there are things that neither emit light nor reflect it," Chen Tian Yuzi suddenly said.

"You mean black holes!" Jos immediately thought along the same lines as Chen Tian Yuzi.

"Black holes, black holes, they appear black, don't they? Invisible, right?" Su Jie said, "They don't emit light, don't reflect light, and they absorb light, so naturally, they appear black."

"They're observable because they block the light from behind, and then the surrounding environment makes them stand out."

"Nowadays, astronomers can take photos of black holes using equipment, based on this principle—the glowing accretion disk around the black hole, which is the most conspicuous light ring captured in the photos, and the vacuum environment around it, all highlight it."

Chen Tian Yuzi clapped his hands, exclaiming in his mother tongue, "Suo ga!"

This means—

Being dark-skinned really does make you stand out in a crowd.

Right, Jos?

Jos's head was covered in dark lines, and he probably realized that Su Jie had made a bit of a joke.

But was it his fault for being dark-skinned?

"Ahem!"

Su Jie also realized this and coughed twice to attract everyone's attention, then continued, "So, to achieve optical invisibility, an object must not only be incapable of emitting light and reflecting it, but it also needs to have a characteristic that lets the light emitted or reflected by objects behind it pass through or around it."

Zhang Manman chuckled, "Then I'm thinking of a material, glass."

"Correct, glass does come close. But the refractive index of light within it is different from that in the outside air, so no matter how transparent the glass, it can only be translucent, not invisible," Su Jie explained.

"But I've seen a lot of videos of people running into glass doors," Jos raised his own confusion.

"Those who bump into them are either distracted, have vision problems, or they're just showing off; those are the three possibilities," Su Jie responded, "Everything you see on the internet has been amplified for effect, taken out of context for views, and such incidents are not common in our daily lives."

"So, if there was a material where light has the same refractive index as air, could it become invisible?" Chen Tian Yuzi thought that if there really was such a material, and it was similar to metal, maybe real optical invisibility could be achieved.

"It's possible, but also not," Su Jie said.

"Huh, how so?" Chen Tian Yuzi didn't understand.

"It's possible because the material itself is invisible, so any object made from it would naturally be invisible too, but it's not possible because it's only the object itself that's invisible. If you sit inside, wouldn't that reveal your presence?" Su Jie laughed. "It's like various cartoon scenarios with 'invisibility accidents,' where the vehicles become invisible but not the people inside them."

"Although it looks comical, it actually aligns quite well with scientific principles."

"After all, the material itself is transparent, with the same refractive index as air, naturally making it invisible, but we humans... even light can't be refracted through us; it only reflects off our bodies."

Chen Tian Yuzi got it: "So, for opaque objects like us to become invisible, there's only one situation where that would work, which is for light to bend around us, much like the stream water flowing around a protruding pebble, rejoining on the other side."

"Yes, in the Ganges River!"

Su Jie nodded seriously. "If light passes over an object's surface without reflecting, behaving like your example with water flowing around a pebble, we'd naturally see what's behind the object instead of the object itself, making it invisible."

"Since light can flow over the surface, other phenomena like electromagnetic waves, and infrared, could also bypass it."

"But there lies the problem—"

"That means when used on a person, they wouldn't be able to see outside at all."

Chen Tian Yuzi finally understood why, after Zhang Manman activated the cloak's invisibility effect, she couldn't see outside either.

So this invisibility cloak was designed to blind the user!