Under the bewildered gaze of the crowd, Elok installed the gear in front of the alchemy instrument that emitted the beam, and placed a very strange-looking glass in the middle of them.

Lynn finally explained. "It's a half-lens! Unlike normal glass, as the name suggests, only one side allows the beam to penetrate! ”

Glenn looked back and forth in amazement, one side of which had a clear view of the rear, while the other was blurry.

"This experiment is also very simple, that is, this alchemy instrument emits a beam of light, when the gear is in a stationary state, the light will be reflected back the original way after shining through the tooth gap to the opposite mirror, hitting the side that cannot be transparent, forming a larger light spot, let us see it intuitively!"

As he spoke, Lynn opened the alchemy instrument, and two beams of light immediately appeared in the air.

As he had said, the light passed through the half-lens, through the gap between the two gears, and hit the mirror in the distance, and then turned back and hit the half-lens again through the gap between the teeth.

"But if this gear starts spinning...... Then the light passing through the gap between the teeth may be blocked when returning. Lynn paused, his mind moved, and under the drive of the [Mage's Hand], the gears slowly turned.

It didn't take much explanation from Lynn, everyone could see that the beam of light behind the huge gear began to fade and fade, and the spot of light hitting the half-lens also became flickering, because the light could just pass through the gap between the teeth when it returned, or it could be blocked by the gear......

Just as the wizards frowned and pondered this phenomenon, Lynn's words came again.

"Theoretically, if the gear speed is fast enough, the light will pass through the second gear gap when it crosses a distance of eight kilometers after passing through the first tooth gap, ......and then it will pass through the second gear gap."

Before Lynn could finish speaking, Glenn said in horror as if he had thought of something. "In this way, every light element that can pass through the tooth gap will definitely fold back through the second tooth gap, there is no possibility of being blocked, and the beam and light spot will become extremely obvious!"

Glenn's words were like a boulder dropped in a calm lake, and the wizards present exploded.

"That's really...... Genius idea! Raphael said in a trembling tone.

He had been wondering what method this magic star would use to measure the speed of light, but he didn't expect that the other party would be able to do it with just a small gear!

The characteristic of the method is two words, shortcut!

The most critical aspect of this experiment was to synchronize the time it took for the gear to turn one section to the time it took for the light to emit and return.

The subtlety lies in the fact that the light travels a full eight kilometers, while the opposing gear only needs to be turned a little bit to reach the second gap!

That is to say, each knuckle on the gear represents a distance of eight kilometers traveled by light, if there are a total of 1,000 knuckles, they turn one circle, the light must run 8,000 kilometers, and ten turns is 80,000 miles!

The wizards, who also understood this, couldn't help but gasp, this little gear is like a super amp!

The speed of light may be incredibly fast, but the speed of the gears can also be increased extremely fast......

"This is to make the gear and light faster than the speed!" Harrov also sighed.

It's just that Lynn is very unmartial arts, and the gears go five millimeters (the distance of one tooth), and the light must run eight kilometers...... Hundreds of thousands of times the difference!

In the end, all you need to know is how far the gear travels multiplied by this multiplier difference - that is, by looking at the number of teeth separated by the gear, and the number of revolutions of the wheel in one second, you can calculate what the speed of light is!

No wonder Lynn was so confident that she could measure the speed of light......

"Amazing, worthy of a magic star!" Sanchez said with a sigh.

He was convinced, what kind of brain could come up with such an idea.

However, there are also many onlookers who always have blank expressions.

What the hell are you talking about? How can I not understand......

But in order to maintain his dignity as a wizard, he still nodded pretendically, and then said a few words of appreciation.

"It's a magic star......" "That's a good idea!" I knew he had a way! ”

In the midst of the appreciation, there were also many voices of opposition, Yathos and others insisted that the speed of light is infinite, and no matter how fast Lynn could accelerate the gears, it was only in vain!

"Dean, can you start?" Lydia shouted loudly.

Lynn nodded, and asked the halfling girl to start the internal combustion engine and increase the speed of the gears.

Under the gaze of everyone, the 720-tooth gear in front of him slowly began to rotate, and then the speed became faster and faster, five, ten, and fifteen revolutions per second...... Soon it turned into an afterimage.

The light spots on the beams and semi-lenses are also flickering at a faster and faster frequency, because the light is always changing back and forth between passing and not passing......

"It's fast...... whispered to herself, she couldn't see the speed of the gears at all. At such speeds, can light really distinguish small tooth gaps? ”

You should know that the distance between each tooth is only 0.5 cm, and it will become a sharp cutting instrument at high speed, what if you can't find the tooth gap when the light element passes through? Then wouldn't they not see it?

"We may not be able to tell, but the light can!" Lynn said with conviction.

"Look, the frequencies at which the beams and flares flicker seem to ...... It's starting to slow down! Raphael hurriedly reminded.

He was not the only one who noticed this, because the change was so obvious that it could never be an illusion, and after the speed of the gears increased again, the faces of the wizards present suddenly showed a look of horror......

"The light spot turned out to be ...... Gone! ”

Sanchez's eyes widened, and in front of him was an incomparably strange sight, the tiny beam of light emitted from the alchemy instrument stopped on the gear when it turned back, and the beam of light at the distance from the gear to the half-lens suddenly disappeared, no longer disappearing as before, and there was no spot of light hitting the half-lens.

This is the exact opposite of what Lynn said......

"What the hell is going on?" Raphael nearly ripped off his beard, his mind full of doubts.

"That's because the light passing through the teeth just hit the knuckles when we returned, which shows that the speed of light is limited, and we are already halfway there!" Lynn's words rang in everyone's ears.