In the novel "invisible man", Wells, the British writer, tries to convince his readers that stealth is entirely possible. The hero in the novel (the author describes him as a "talented physicists in the world") has invented a way to make people's bodies invisible. Below is the basis of his knowledge of his invention to a familiar physician.
"We can see something because it can work on light. You know, objects absorb light, or reflect light and refract light. If an object neither absorbs light nor reflects light or refracts light, it can not be seen at all. For example, you can see the opaque red box, because the red paint can absorb part of the light and reflect the rest of the light. If the box does not absorb any light at all, it will reflect all the light. It will be a dazzling white box in our eyes, just like silver. The flashing box can only absorb very little light, and its surface does not reflect much light. It only reflects and refracts light on the edge of the box on some sides of the box, so that we can clearly see its glittering reflection of light - something like a luminous skeleton. The glass case is less luminous. In our eyes, it is not as clear as the box with flashing light. This is because the reflected light and refraction light are less. If you put a plain white glass in water, especially if it is placed in a liquid larger than water density, it will almost not be able to see it, because the light passing through the water to the glass is refracted and reflected very little. The glass has become invisible to a carbon dioxide or hydrogen floating in the air. "
"Yes," Camp said. "It's all very simple. Today, every student knows it."
"But there is another thing that every student knows. If a piece of glass is crushed into powder, it becomes very easy to see in the air - it becomes opaque white powder. Why is that so? Because breaking up glass is to increase its surface, that is, to increase the amount of light reflected and refracted by it. There are only two sides to the glass sheet, and every particle of the glass powder can reflect and refract its light, so there is very little light to pass through. But if the broken white glass is placed in the water, it will soon disappear. Smashed glass and water have almost the same refractive index, which makes light come from water into glass or from glass into water, and there is very little refraction and reflection.
If you put the glass in any liquid with the same refractive index, you can't see it: any transparent object will be invisible if it is placed in the same medium as the refractive index. Knowing this, we can believe that we can make glass invisible in the air if we think about it a little bit: we try to make the refractive index of glass identical to that of air, because when light is passed through the glass into the air, it will no longer be reflected, nor will it be folded.
"Yes, yes," Camp said, "but you know, people are not glass."
"No, people are more transparent than glass."
"Nonsense!"
"Natural scientists say so! Did you completely forget physics after 10 years? For example, paper is made of transparent fiber, so it is white and not transparent. It is the same reason that white glass and white light are not transparent. But if you put oil on the white paper to fill the gap between the fibers, so that the paper can only refract and reflect light with the surface, then the paper will become as transparent as glass. It is not only paper, fabric, wool fiber, wood fiber, bones, muscles, hair, nails and nerves. In short, everything in human body is composed of transparent and colourless tissue except hemoglobin in blood and melanin in hair. So it's not very hard for us to see each other. "
One fact can also be seen as evidence of this kind of perception, that is, animals without albinism and lack of pigments in tissues are quite transparent. In the summer of 1934, a zoologist found a white frog with no pigment in the children's village. He once described it as "thin skins, transparent muscles, and internal organs and bones. Through the abdominal wall, we can see clearly the beating of the heart and the peristalsis of the intestine.
The protagonist in Wells's novel invented a way to make all tissues in the human body and even the pigment in the body transparent. He succeeded in applying the invention to himself. The experiment has made brilliant achievements: the inventor himself has become completely invisible.
Related information:
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Stealth technology is no longer a dream.
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