Amy followed Ella to the cabin with a blank look on her face. Ella said she wanted to shock the Aztlans a little bit of sun god, but she could not think of what Ella could do with that piece of sandpaper.

"Your Majesty, what are you going to bring out? You can't move the catapult to the artillery covering ceremony venue, right?"

This is the only solution Amy can come up with. If the ammunition of the catapult is replaced with a fire bomb, then the "fire" falling from the sky can barely be said to be "the shock of the sun god" - although this plan has nothing to do with sandpaper.

"Take? That's a good idea. There are many trenchers along the coast of Mevara Niga." Ella stopped and thought for a while, "But trenchers are not easy to carry. How do we get Tessosomok and Osomalit to agree to set the trenchers in advance in the venue?"

"I just said it casually... So what is your Majesty going to do?"

"Just come with me!"

Ella took Amy all the way back to the bottom of the flying Zelan. After docking on the beach of Movara Niga, the seaworms at the bottom of the ship were killed because they were far away from the sea water for a long time. After repairing the bottom of the ship, the cargo could be re-shipped here.

But I saw Ella rushing around the middle of a pile of goods, and finally dragging out a half-person-high copper plate.

"What's this?"

Amy took the copper plate from Ella. Although the copper plate was very large, it was not very difficult to lift it up because it was thin. She looked left and right at the copper plate, looking up and down. She thought it was just an ordinary copper plate, which was closer to the bowl in terms of curvature, but it was too big as a bowl; as a mirror, it was not polished and too rough; there was no decoration, pattern or carving on it, so it was not even a work of art.

"Shield Ultra-Thin Edition?"

"This thing is called Yangshu, which is a magical prop I read from ancient documents."

"What is... Yangshu?"

"According to literature, there is a legendary prop in the ancient East. It looks like a metal plate from the outside, but the flames will ignite where it is illuminated." Ella replied, "I tried to reproduce it, but for some technical reasons, it has not been completed yet, so it is just like this in front of you."

Amy looked at the copper plate again, and no matter how she looked, it was just an ordinary copper plate, without magic spells, nor the power of magic. She raised her head and was about to ask questions, but Ella suddenly blew out the candle, and the room suddenly became dark.

"Amy, can you see the wall behind you now?"

"I can't see at all! Your Majesty, what are you going to do...?"

After a collision of flints, the candle lit up again

"Can you see it now?"

"Of course it can... Your Majesty, I just can't see what's special about this copper plate. You don't need to test my intelligence like this, right?"

"How can we test intelligence? It's just a test for you." Ella said, "Amy, have you ever thought about it? Why can we see the entire wall just by lighting the light?"

"Of course it's because there's nothing!"

Ella nodded: "Amy, have you ever looked directly at the sun?"

"There are...but it's hard to stick to it, it's too dazzling."

"You have ever thought about the sun's light is so dazzling, why are the walls under the sunlight not dazzling?"

"Of course it's because we didn't look straight at the sun!" Amy was anxious, "Your Majesty, you are indeed suspicious that something is wrong with my head, right?"

"Can't you see the sun without looking at the sun?" Ella smiled. "Then let's go to the deck now, I'll take the mirror to face the sun, and then you look directly at the mirror?"

"No! That would be very dazzling, so say... wait a moment."

Amy suddenly paused, and a confused look gradually appeared on her face: "Huh? Why are they facing the sun, but the mirror is dazzling, but the walls cannot?"

"Did you realize it? Amy, you are actually quite smart," Ella said with a smile. "If you think about it again, you actually look at it from many angles. The mirror facing the sun will not be dazzling. Only in a specific direction can we see the dazzling sunshine from the mirror, right?"

“Yes…so?”

"Amy, sit down," Ella said, "I'll tell you the principle of light reflection."

"I don't really want to learn. Last time, His Majesty asked me to look for Uranos in the sky, but I haven't found it yet." Amy complained, "I will have a headache after listening to these academic problems for a long time."

"Amy, how can you do this?" Ella sighed. "I set up a staff department for you to correct the mistakes in my combat plan. But since I will make mistakes in the combat plan, won't I make mistakes in academics? I also need someone to correct them."

"I don't have the confidence to correct your academic mistakes for you... Your Majesty, why not, you can just talk about it briefly... I will try my best to understand."

"Okay, let's just say the conclusion... We can see things because light reflects on the surface of that thing, causing light to enter our eyes. The reflection of light is at a fixed angle. The surface of the mirror is very smooth, reflecting the sun's light in the same direction, so it will be very dazzling at a specific angle. But the surface of the wall is very rough, and the light is reflected in all directions, so it is not so dazzling." Ella patiently explained, "In addition to the reflection of light, there is also the refraction of light. These two points are the basic theory of my creation of the Eye of Hermes. Do you know that even the moon is only seen by us after the reflected sun's light."

"Even the moon is? Who proposed the theory?"

"Anacasgra. But the principle of reflection refraction was discovered by Alice Bedford, that is, me." Ella raised her chest proudly, "The mirror is flat, and the reflected sunlight is so dazzling. Amy, have you ever thought that using this principle, just give the smooth mirror a curved arc so that all the sunlight that comes in is focused to a point after reflection, can we fully utilize the power of the sun?"

"Use Apollo's powers entirely...magic?"

"It's a technology. When I read the records of Yang Sui, I guessed that it was this principle. But to gather sunlight, the surface of copper must be a smooth curved surface. It is difficult to polish the curved surface so smooth with stones, so this thing has always maintained this way."

Speaking of this, Ella excitedly took out the piece of sandpaper she had brought from the stonemason.
Chapter completed!