69 Its Pathetic (1/2)
”I suppose that I need to talk about what is light, huh” Arima said and mused for a moment ”Well, s.h.i.+t, it's really harder to explain than I thought” He then said with a complex expression.
After a minute of thought Arima pointed at the light he had created earlier ”You see this light, right? It is actually produced by something we call electromagnetic waves. Those electromagnetic waves can actually do a lot of things, and the visible light is only a small part of it. These waves are determined by what we call their frequency or their wave lengths” He explained
At this point, the smarter students could more or less follow but even the ones who didn't understand were writing on their notebooks.
”So, I won't go too much deeper on that. But remember one thing, the light you usually see is produced by electromagnetic waves, and once its frequency goes over or below a certain limit, it isn't visible with the naked eye anymore. And it also starts to gain different particularities” Arima resumed.
”Now look at this” Arima waved his hand and something like a timeline was projected in the air. If someone from the modern world was here, they would recognize this. It was the frequency scale of electromagnetic waves.
”A small part of this line is visible light” Arima said and two points on the line s.h.i.+ned ”These two points represent a certain frequency, and between those too, there it the visible light” He explained then looked at his students ”Do you follow so far?” He asked and everyone nodded, kinda.
”Well, just note it, you'll ask me what you don't understand after” He wryly said and continued ”Below visible light, well, when the frequency increases, there's UV's” He said and another part of the line was defined by two points ”But we won't talk much about it, and go even below. At that point, there is X rays” Arima said
”X rays are ionizing, meaning that they are very harmful to the human body, they can create serious illness and health problems. But you can easily protect yourself from it with magic. Now, the most useful way of using those is like this” Arima said and waved his hand in front of Night. A sort of gray screen formed and prevented the students to see Night's figure. Arima pointed at the light in the air and brought it behind Night.
Arima's sigil glowed and the light disappeared, at least, with the naked eye. Instead, a skeletal representation of a small wolf cub appeared on the gray screen.
The students exclaimed at such a strange phenomenon ”What I did here was using the X rays to see Night's bones” Arima said and made disappear the screen while making come back the light from before.
”The X rays pa.s.s through the flesh easily and will make a black mark on the screen, while when the rays pa.s.s though bones, which are more dense, they will create a white mark, outlining the bones. The screen is usually made in metal, I just reproduced a similar effect” He explained.
”In my homeland, this technique was used in medicine” Arima declared ”But I want you to remember that it's really dangerous if you are constantly being in contact with it” He warned and everyone nodded.
”Next, there is the gamma rays, with a higher frequency, even more dangerous than X rays. They're highly penetrating and can, not only weaken your body and provoke illness and mutations, they also can damage internal organs and the bone marrow” Arima explained ”So, basically, highly dangerous” He said to conclude.
”Now let's go back to the visible light, with a smaller frequency, you stumble upon infrareds” One part of the line was one more time defined ”Those are not really dangerous, they can be, but not as much as X or gamma rays” Arima said ”But, infrared radiation is useful for one thing”
”To show you” Arima plunged the room into darkness ”All of you, close your eyes” He smiled and instructed. Everyone did as he said. Arima's sigil and eyes, glowed in a red light and all of his students felt a warm feeling in their eyes ”Open them now”
When Arima said so, they opened their eyes, and everyone exclaimed. Red. They could see Arima and their cla.s.smates, but it only was their silhouette.
”Okay” Arima said and light returned ”What you just experienced was thermal vision. Each source of heat releases an infrared radiation, when you find a way to see those radiations, you can see everything releasing heat around you” Arima paused and smiled ”Of course, humans as well”
Arima waved one more time his hand at the frequency scale ”The last one, microwaves. I'll be quick, these waves interact with matter and are usually used to heat things. But of if you overload the quant.i.ty, it could do scary things” Arima grinned ”Like frying your brain, for example”
The students gulped and nodded strongly, to say they understood.
”Good” Arima clapped ”The rest are radio waves and are not useful for you. The reason I explained you all of that, was because gamma rays, X rays, infrareds and micro waves can be extremely useful. And also, because magic is always stronger when you know the principle behind it” He smiled ”Now, if your apt.i.tude with light magic doesn't increase then something's wrong” He said and looked at Ofia. The latter nodded with a serious expression.
”Well, that was the underlying process as to how light is produced” Arima said ”Now let's talk about was the visible light can be used for”
”The first use I can tell you about is projection. The projections I'm making to help you understand, like this line or the figure. Now, as to how it works, I won't go in detail, but basically, colors are deeply related to light, so that why you can create projections” Arima explained.