Rainbow rainbow is an optical phenomenon in meteorology. When the sun shines on the water droplets in mid-air, the light is refracted and reflected, forming an arched color spectrum in the sky. There are different opinions about which seven colors the rainbow is. China is the most common (from outside to inside): red, orange, yellow, green, cyan, blue and purple. The western saying is: red, orange, yellow, green, blue, indigo and purple, which are derived from the names taken by scientist Newton after decomposing seven primary colors. In fact, as long as there are water droplets in the air and the sun shines behind the observer at a low angle, an observable rainbow phenomenon may occur. Rainbow usually appears in the afternoon, when the rain clears. At this time, the air is less dusty and full of water droplets, and one side of the sky is dark because of rain clouds. However, observers can see the sunlight without being covered by clouds above or behind them, so rainbows are easier to see. Another place where rainbows are often seen is near waterfalls. When the weather is clear, you can spray water or mist into the air with your back to the sun, or you can make rainbows artificially. Sunset is a rare phenomenon, which may appear in the night with strong moonlight. Because it is difficult for human vision to distinguish colors in the case of weak light at night, the night rainbow looks all white. Image reference: upload.wikimedia/ * * */Mons/Thumb/7/75/450px-epcot _ rainbow/180px-450px-epcot _ rainbow Image reference: zh. * * */skin-1.5/mon/images. Enlarge-cut rainbow picture reference: upload.wikimedia/ * */Mons/Thumb/7/72/Disambig.svg/25px-Disambig.svg This article tells a natural phenomenon. A set of software with the same name, see Rainbow (Software) for details. Directory [Hidden] 1 Principle 2 Rainbow in Myth and Religion 3 Rainbow in Literature 4 See Principle Picture Reference: upload.wikimedia/ * * */Mons/Thumb/8/8e/rainbow _ formation/180px-rainbow _ formation Picture Reference: zh. * */Skins-1.5/mon/images/Magnify-clip The optical principle of the rainbow is that sunlight shines on spherical water droplets in the air, resulting in dispersion and reflection. When sunlight enters the water drop, it will be incident at different angles at the same time and reflected at different angles in the water drop. The reflection of 40 to 42 degrees is the strongest, which produces the rainbow we see. When this reflection occurs, sunlight enters the water drop, refracts once, then reflects on the back of the water drop, and finally refracts again when it leaves the water drop. Because water has a dispersive effect on light, the refractive index of light with different wavelengths is different, and the refractive angle of blue light is greater than that of red light. Because light is reflected in water droplets, the spectrum seen by the observer is reversed, with red light at the top and other colors at the bottom. Image reference: upload.wikimedia/ * * */Mons/thumb/0/0e/arc-en-CIEL _ secondaire/180px-arc-en-CIEL _ secondaire Image reference: zh. * * */skin-1.5/mon/images. Enlarge-edit double rainbow with neon outer ring and inner ring as rainbow picture reference: upload.wikimedia/ * */zh/thumb/e/E5/rainbow _ in _ nuernberg/180px-rainbow _ in _ nuernberg picture reference: zh. * */Skins-1.5/mon/images/zoom in-Rainbows and neon lights over Nuremberg often appear at the same time after the rain, and a concentric but darker secondary rainbow (also called neon) will appear in addition to the usual rainbow. The secondary rainbow is formed by two reflections of sunlight in water droplets. The strongest reflection angle of the two reflections occurs at 50 to 53, so the position of the secondary rainbow is outside the main rainbow. Because there are two reflections, the color sequence of the auxiliary rainbow is opposite to that of the main rainbow, with the outer side being blue and the inner side being red. In fact, the auxiliary rainbow must follow the main rainbow, but sometimes it is invisible to the naked eye because of its low light intensity (see). The rainbow does not actually appear in a specific position in mid-air. It is an optical phenomenon seen by the observer, and the position of the rainbow will change with the observer. When an observer sees a rainbow, its position must be in the opposite direction of the sun. The center inside the rainbow arch is actually an enlarged image of the sun reflected by water droplets. So the sky inside the rainbow is brighter than the sky outside the rainbow. The center of the rainbow arch is just the direction of the observer's head shadow, and the rainbow itself is 40 to 42 degrees above the line between the observer's head shadow and his eyes. Therefore, when the sun is higher than 42 degrees in the sky, the rainbow will be below the horizon and invisible. This is why rainbows rarely appear at noon. The rainbow extends from one end to the other. With an ordinary 35mm camera, you need a wide-angle lens with a focal length below 19mm to capture the whole rainbow in a single frame. If you are on an airplane, you will see that the rainbow will be a complete circle instead of an arch, and the center of the circular rainbow is the direction of the airplane. Image reference: upload.wikimedia/ * */zh/Thumb/b/b2/Twin _ rainbow _ over _ isle _ of _ isle/180px-Twin _ rainbow _ over _ isle _ of _ isle Image reference: zh. * */skin. Mon/images/magnify-clip Rainbows and Neons over Scotland 1307 It has been suggested in Europe that rainbows are caused by water droplets refracting and reflecting sunlight. Descartes found in 1637 that the size of water droplets does not affect the refraction of light. He experimented by injecting water into the glass ball and got the refractive index of water to light. He mathematically proved that the main rainbow is caused by reflection at the water point, while the auxiliary rainbow is caused by two reflections. He calculated the angle of the rainbow accurately, but failed to explain its colorful colors. Later, Newton discovered all the optical principles of rainbow formation after scattering sunlight into color with a glass rhombus. Rainbow Picture Reference in Myth and Religion: upload.wikimedia/ * * */Mons/Thumb/2/27/Where rainbows/180px-Where rainbows Picture Reference: zh. * * */Skins-1.5/mon/images/Magnify-clip Rainbow rises. In Genesis 9: 13 of the Bible, after the flood, God made a covenant with Noah and his descendants with rainbows, and never again flooded the world. In Greek mythology, the rainbow (Iris) is the messenger of communication between heaven and earth. In Irish mythology, rich goblins put their treasures at the end of the rainbow. Some non-Chinese characters are hidden because they have not been translated. Welcome to participate in translation. Show ▼ Rainbow occupies a place in the legend because of its beauty and the different terms explaining the nature of light before Galileo's treasure.
The rainbow is called Indra-it means Indra's bow.
God of thunder and lightning. In Norse mythology,
A rainbow called Bifr? The holy bridge connects Asg's territory Rd and Midg? Registered dietitian
The home of the gods and the hum
They are. See the photo reference of Halo-Moon Halo: upload.wikimedia/ * */mons/thumb/4/4a/commons-logo.svg/45px-commons-logo.svg You can find the multimedia resources related to this item in Wikipedia * * * resources: Category: Rainbow from zh. * * ... Title E =% E5% BD% A9% E8% 99% B9 & variant = zh-"
Reference: Yahoo
Some people say that rainbows are red, orange, yellow, green, blue, blue and purple.
Purple, blue, cyan, green, yellow, orange, red, red, orange, yellow, green, blue and purple are counted from top to bottom, and purple, blue, cyan, yellow, orange and red are counted from bottom to top. The sun also shines on the water point.
But there are seven colors of white light. The seven colors in white light are red, orange, yellow, green, blue, purple/red, orange, yellow, green, blue and indigo!
The emittance of colored light with different frequencies is different from that of the medium, and sunlight itself contains colored light with different colors (frequencies), so when sunlight refracts, the refraction angles of different colors of light will be different and separated, thus forming dispersion phenomenon. When the sun runs in the sky and meets tiny water droplets, very little light will be reflected back into the air, and most light will be refracted into the water droplets. Because the light of different colors will be deflected to different degrees when refracted on the surface of water droplets, the light of different colors in water droplets will be slightly separated. When the light meets the boundary between water droplets and air for the second time, most of the light will be refracted again soon. A small part of the light is reflected and continues to travel in a straight line in water droplets until it meets the boundary between water droplets and air for the third time. At this time, most of the refracted light may form the "rainbow" we see, because the light of different colors is separated more after being refracted twice. As for a small part of the light reflected back to the water drop, most of it will still be refracted when it meets the boundary between the water drop and the air for the fourth time. Because these rays shoot into the sky, people on the ground can't see them. The other beam of light entering from below the water drop will go through the process of "refraction-reflection-reflection-refraction" and then hit the ground. These scattered beams are likely to form the "neon" you see. Combine all the light paths parallel to the red beams of water droplets, and these beams are refracted in the water droplets for the first three times. Refracted light accounts for about 90%. The downward light appears dense in two places, corresponding to the "rainbow" and "neon" seen respectively. Light must enter our eyes before we can see it. People have to face, that is, with their backs to the sun, to see the rainbow formed by the sun. When the sun's rays are parallel to the ground, rainbows can be seen near the elevation angle of 40-42, and weak neon may be detected near the elevation angle of 51-54. When facing away from the sun, all the light that enters the eyes at a fixed angle at the same time is a cone, so the rainbow you see is round. Moreover, rainbows seen by different people are reflected by different water droplets. Seeing the same rainbow, blue light and red light are also refracted from different water droplets. It can be said that everyone sees their own rainbow.
Either red, orange, yellow, green, blue and purple is red, orange, yellow, green, blue, indigo and purple.
It is red, orange, yellow, green, indigo and purple ~ because sunlight refracts into water.
Solution? hear nothing of
Reference: I