The next evening, thousands of wizards and civilians gathered outside a street in Greenriel City, watching Glenn and the others hang smooth mirrors on every wall of the street......

"There are only the last fifty mirrors left, all of which are placed for me according to the drawings, and the angle must not be wrong in the slightest!"

Glenn loudly instructed Nancy and the others to place the mirror in the right place, and adjust the angle according to the results of his precise calculations.

Thanks to the sorcerer's steady hand and high precision, if it is said to be fifteen degrees, it will never be placed at sixteen degrees, otherwise it would not be easy to connect the reflected light of these hundreds of mirrors in series.

Just the various refraction angles, the seven wizards together calculated, it took a whole day!

To Green's relief, the process of borrowing the mirror went very smoothly, and after knowing that it was used for the speed of light measurement experiment, many curious wizards generously contributed the round mirror they had bought earlier.

He even got parliamentary approval to use the streets and squares of Greenrier City as a venue for experiments when the sun went down and the shops were closed.

It took Glenn and the others more than an hour to set up the last fifty mirrors, and by the time they were done, the sun had already set, and the whole city of Greenriel was pitch black.

At his request, there was no candlelight in all the houses, and everyone could only see their surroundings by a little moonlight.

"Glenn, now you can say that, right? What are you asking us to borrow so many mirrors for? Planning to use this to measure the speed of light? A wizard who knew Green could not wait to ask.

Everyone present also had an expectant expression, due to the temptation brought by the Silver Moon Medal, there are not a few wizards who want to complete this experiment, and there are all kinds of ideas, but Glenn is the first to put ideas into action!

Facing everyone's eyes, Glenn also looked a little nervous, but he still explained endlessly. "My plan is to measure the speed of light by using the principle that mirrors reflect light to increase the distance traveled by light, and thus measure the speed ......of light."

He placed a large number of mirrors in Greenrier City, and when he did, he would create a beam of bright light from the entrance of the DC area, all the way through the mirror surface to the XC area, and then to the south city area, and then turn back in a circle......

"In total, it takes a thousand reflections, a total distance of a hundred kilometers!" Glenn said proudly.

He had calculated exactly where the mirrors would be placed, meaning that they only had to stand still and wait for the light to circle around Greenriel, and the final landing point would be the tower above their heads!

"I placed a white cloth at the top of the tower, and when I saw a prominent spot of light on it, it meant that the light had turned back and covered a hundred kilometers, and I could calculate the speed of light by extrapolating the time it took to calculate ......," Glenn explains.

"What a novel idea, how can it be ...... like this" Raphael suddenly realized, and looked at the wizard named Glenn with admiration, so that it only took a few streets to create a distance of a hundred kilometers and experiment under their noses.

The rest of the wizards were also immediately interested, Glenn's plan still sounded very feasible, that was a full hundred kilometers, and the light element would need to run for a second or two, right?

"Dean Lynn, do you think this can measure the speed of light?" Alok couldn't help but ask, he knew that the Dean had been preparing related experiments recently, which would determine the ownership of a Silver Moon Medal.

"It's possible, but it's not possible......" Lynn smiled and said mysteriously, without revealing the answer.

I have to say that Glenn is still quite creative, and he can even think of this method, but he still lacks some consideration......

Seeing that Lynn said so ambiguously, the wizards on the field couldn't help but pout, it seems that even this magic star doesn't know the result, so they can only use this kind of excuse to save face.

But that's right, if the other party had known in advance, I'm afraid the speed of light would have been measured long ago...... After all, this experiment is not complicated, as long as there are enough mirrors, it can be easily replicated.

Glenn didn't try to theorize the words of the crowd, took the drawings in his hand and confirmed them one last time, took a deep breath, and adjusted his state.

Time ticked by, and when there were about three seconds left before zero, Glenn raised his hand, and a hot fireball appeared in the air, lighting up the entire street.

But this was only the beginning, Glenn and five other wizards cast spells together, and under the surge of magic power, circles of reflection began to appear around the fireball, forming a closed sphere in mid-air, enveloping the fireball, leaving only a small hole one centimeter in diameter......

The light released by the entire fireball was gathered and flew out through small holes, and the target was the first round mirror.

Glenn controlled the time with great precision, and it was the moment when the magic clock reached zero o'clock, and in the eyes of countless people, dazzling beams of light appeared in the entire street, which stretched to the end of the field of vision under the continuous reflection of the mirror.

Nancy had her back to Glenn, her eyes were only staring at the top of the tower, not daring to blink at all, for fear of missing the point of light that appeared, and she was holding a magic clock in her hand, and the moment she saw the point of light, she had to stop it immediately, and the last time it would take for the light to pass through a hundred kilometers.

One second...... Three-second ...... Five-second ...... Ten seconds......

Nancy's eyes were sour, but the white cloth on the tower was empty, and there was no point of light.

"Doesn't that look like the speed of the light is very fast...... It's been more than ten seconds, why hasn't it arrived yet? Alok muttered.

"That's a full 100 kilometers, and even if it's fast, it will take half a minute, right?" Pierce said with a smile.

Raphael and the others frowned, and a thought vaguely appeared in their minds, could it be that there was something wrong with the experiment?

Thinking like this, several great wizards flew up directly, intending to look around the entire city from high in the sky to find out what the problem was.

Glenn below also sensed that something was wrong, because the light intensity was much faster than he expected after a few mirror reflections as far as his eye could see......

About ten seconds later, Raphael and the others returned from the air, and the expression on their faces became a little helpless.

"Master Raphael, how's the situation going? Is it that the light has not yet arrived? A friend of Glenn's hurried forward and asked curiously.