Chapter 539 252 Turn the World Upside Down!! (8.8K)_3

In fact, the light path of the rotating mirror method for measuring light speed can be shortened to around 20 meters, but Xu Yun opted for five kilometers, a value that the University of Cambridge could spare, to enhance the experiment's appeal.

Conducting an experiment in a 20-meter space and demonstrating it over five kilometers would attract audiences on completely different levels.

Anyway, the light path and the rotational speed of the mirror have a positive correlation; when the light path is extended, you just need to adjust the speed accordingly.

As Xu Yun approached the edge of the site.

Faraday stood silently alongside Stokes at the control panel, frowning, saying nothing.

Their expressions held unmistakable confusion but also glimpses of understanding, as if they were touching some boundaries.

Seeing this, Xu Yun stepped forward and greeted the eminent figures one by one:

"Your Majesty Albert, Dean Huai Wei, Mr. Faraday, Professor Stock, good evening."

"Hm?"

Upon noticing Xu Yun's appearance, Faraday suddenly lit up like a reader seeing the author's update and pulled him close:

"Student Luo Feng, what is the concept behind this equipment? Quickly, tell me all about it!"

Faced with this situation.

Xu Yun hadn't yet responded, but William Whewell, who had been tense all along, felt a slight relief.

Although William Whewell coined the term 'scientist,' his primary focus was in the field of philosophy.

His knowledge of physics was not ignorant, but relatively sparse.

Thus, although he participated in preparing this equipment throughout, he felt uneasy.

But from Faraday's words...

It seems Xu Yun's equipment indeed has something to say?

Xu Yun's wrist was aching from Faraday's grip, but he didn't feel comfortable asking him to let go, so he pondered briefly and said to Faraday:

"Mr. Faraday, this equipment is designed by the Fat Fish Ancestor, known as the rotating mirror method for measuring light speed."

Then he pointed to the rotating mirror diagonally opposite and explained:

"First, start shining the light from the source and adjust the rotating mirror's position so that it precisely directs the light straight to the center of the concave mirror five kilometers away."

"This way, the light first reaches the concave mirror and then returns to the rotating mirror."

"The returned light will be refracted by the rotating mirror and hit the imaging plate right next to us."

"We just need to gradually adjust the rotational speed of the mirror, consequently shifting the position of the light spot."

"Once the light spot is in its optimal position, we can collect the data and start calculating the speed of light."

As Faraday listened, his blinking became as frequent as a vibrating stick by the end.

A moment later.

Ignoring Prince Albert beside him, Faraday walked to the control panel, picked up a pen and paper, and started drawing a diagram.

"Light source s.....half-silvered mirror surface M1....."

"Lens L....rotating mirror M2....."

"M2 reflects onto the concave reflector M3....."

Then he paused, looked at Xu Yun, and asked:

"Where is the center of curvature of the M3 mirror surface?"

Xu Yun pointed to the rotating mirror and replied without hesitation:

"On the O-axis of the mirror surface, at the 3/4 position."

Faraday said nothing, and whizzed back to calculating:

"O-axis... then it's correct; symmetric reflection will occur..."

"The s′ point creates an image source moving left....."

Seeing this, Stokes and the other professors also gathered around Faraday to discuss the diagram.

The figures present, if not globally top-ranked, were at least in the first tier in the field of physics, with capabilities beyond doubt.

They hadn't realized that the steps of the experiment were an issue of inspiration, not much related to theoretical knowledge.

Now that Xu Yun announced the entire operation process, with their capabilities, they could quickly analyze the specific principles.

".....So the angle turned by the reflected light is the approximate angle of the light path?"

"No, no, no, it should be twice that....."

"Does the concave mirror need to use Gauss's curvature for calculation, or is it fine as long as direct reflection is possible?"

"Ah right, right, right!"

A few seconds later.

Stokes suddenly frowned and raised a question:

"The general concept is fine, but shouldn't we consider the full extinction condition?"

Faraday stopped his pen once more, remained silent for a few seconds, then wrote down a formula:

4lw/c+Θ=（n+1/4）2π/n.

After writing, he drew a line beneath the formula:

"How about this condition?"

The professors looked at the formula Faraday wrote, starting another round of discussion:

"...Seems fine, but what is the range of n?"

"Would it be better to compare directly using angle and angular velocity?"

"Good idea, but in that case, the light path should be 2l+2d, right..."

"Why use 2l+2d? We're clearly discussing the reflected stage's light path, shouldn't it be 2d+l!"

"Are you stupid? Doesn't the reflection angle need to consider the situation of m3?"

"Little rascal, is your brain busted? What's there to consider about m3 thinly?"

Just as the professors' debate was in full swing, a soft voice suddenly sounded to the side:

"Uh... professors, is there a possibility we just need to consider speed?"

Upon hearing this, the site immediately fell silent.

In the next second.

Everyone, including Faraday, turned to look at the speaker.

Xu Yun shyly raised his hand at that moment, smiling with a grin more naive than wheat grain at them.

Only then did they realize they had discussed for so long, and somehow forgot the designer Xu Yun on the side...