1 rainbow 2 Name the rainbow by that name 3 rainbow angle 4 The physical explanation of its formation 5 types of rainbow 6 harms of rainbows and scattering light 7 rainbow and superstitions 8 References Rainbow A rainbow arch is a multicolored arc where it appears after the rains fall or during the rain and the sun is shining, which is a natural physical phenomenon that occurs as a result of refraction and reflection of sunlight through raindrops. The color sequence in the arc usually appears red from the outside and progresses to orange then the color Yellow then green, then blue, then indigo, and finally purple in the interior, and it often appears as a semicircle and in some cases it is caused by the refraction of moonlight through water droplets . It must be mentioned that the rainbows that we see are actually full circles, but the person on the surface of the earth cannot see them, while passengers traveling through the air can sometimes see them. [1] [2] [3] Volume 0% The rainbow is not a physical object that can be touched but rather is an optical illusion or the closest thing to a mirage and has no specific or fixed place in the sky , and your vision of the arc depends on where you stand and the location of the sun or the source of light, so that the sun must be behind the person watching the arc. [1] Name the rainbow by this name There is a difference in the meaning of iris, it was said: It is from the iris, i.e. the height, and it was said that it collected the iris, which is a method by which colors are formed, and it is a bow that appears in the sky and is on the horizon side facing the sun, and consists of successive colors of the spectrum as follows: purple, indigo, blue, green Yellow, orange and red, caused by the reflection of sunlight on water splashes in the air. There are those who said: It is the name of the king entrusted to the clouds, and it was said: It is from the dread, and the dread is the clouds , and it is said that the rainbow is one of the names of Satan, so it is preferred to say the rainbow or the arc of God. [4] [5] [6] Rainbow angle When seeing a rainbow, this indicates that the viewer's eye is in the direction opposite to the direction of the sun's rays. Most types of rainbow are formed when sunlight falls 42 degrees on raindrops. [1] The physical explanation of its formation It is worth noting that lightWaves with a red color have a long wavelength and their speed is relatively slow, while the waves with a violet color have a short wavelength and their speed is relatively fast, and when light enters from one medium to another differing in density, the light will refract and change its path. Initially, the sunlight is refracted when it enters in drops Circular rain, then the light is reflected again on the posterior inner surface of the water droplets, then it is refracted again when it comes out of the droplets, and since the refractive index differs according to the wavelength, the angle of refraction differs according to the wavelength, so the wavelengths will be broken It has a red color and a slow speed at a lower angle than the short waves with a violet color and a high speed - where the refractive index increases as the wavelength decreases - and since each color is broken at a different angle, the waves are dispersed forming a series of colors ranging from red to violet, which is the same idea of the principle of action The prism is separatedGlass and air. As for the color that has a high velocity in the glass, there is no effect on it. Therefore, the white light that consists of the colors of the spectrum will be distinguished according to the speed and frequency of each color when it passes through the glass. [3] Rainbow types The rainbows are classified according to their shape or the light source that causes them, and these types include: [1] Arch natural rainbow: shows the shape of a half circle or arc as we see it normally. Double rainbow: It appears as two arcs over each other, and one of them is less clear than the other. Twin rainbow: It appears as two brackets next to each other and appear as if they are leaving the same point. Red rainbow: or what may be called a red twilight or a monochromatic arc, and it appears at sunrise and sunset, and it is formed because the red color with a long wavelength travels a greater distance through the sky and is dispersed by the rest of the colors with a short wavelength (blue and violet) thus red appears alone in the sky. Fog arc: It mostly looks like a natural rainbow, but because the water droplets suspended in the air in fog are smaller than regular raindrops, the fog arc is not easily noticeable and usually tends to white more. Moon arc: It is an arc caused by the reflection and refraction of the moonlight during water droplets. Of course, because the moonlight is more dim than sunlight, it is faint than the natural rainbow. Rainbow harms and scattered light Rainbows may form picturesque landscapes, but they may pose problems for optical systems. White light is used to transmit messages across [optical fibers and scattered across fibers that may lead to message mixing or loss, and thus can be annoying. [3] Rainbow and superstitions The rainbow was associated with many superstitions where people usually link its appearance with the presence of treasures or jewelry that are at the end of the arc, and there are those who claim to be bridges connecting our world with the supernatural worlds, and in other accounts it is said to be an arc of one of the deities and uses them to throw his arrows that make up the lightning . [1]
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