The rainbow's colors are red, orange, yellow, green, blue, indigo, and violet. These are the wavelengths of light that are visible to the human eye. Other animals have different types of receptors for detecting color. Humans see color because of how the retinas of our eyes work. The cells in our retina contain chemicals called pigments, which filter out some of these wavelengths of light and transmit others to the brain for processing more information than just black or white.
When light from the sun hits water droplets in clouds, it is reflected back toward earth as a broad spectrum of colors. The entire spectrum can be seen with the unaided eye when sunlight is incident on the water surface at an angle greater than 20 degrees but less than 60 degrees (the lower limit depends on the clarity of the water). At lower angles, only the colors within certain ranges can be seen.
Rainbows are formed by the reflection of light from the atmosphere, which has been diffracted by raindrops. The color of a rainbow is determined by the type of particle that causes the most refraction when passing through the air: water drops reflect red, green, and blue light to form a color wheel that rotates with the apparent movement of the moon across the sky.
This color sequence creates the recognizable pattern that we all know and remember from infancy thanks to the usage of mnemonic words. These names come from the English language but they are used by many other languages as well.
The original rainbow story dates back to God's creation of the world in the Book of Genesis. When God decided to reward the effort of man by creating a new world for him to live in, he told them not to eat from any tree of the garden. However, after hearing the plea of a woman named Eve, who was tempted by Satan (a character from the Book of Genesis) to eat from the tree of knowledge of good and evil, God made a condition that if she ate from it she would not die but would instead give birth to children. Since then, people have associated death with going through a rainbow because those who are dying often say that they can see a rainbow. This is how the phrase "dead ringer" originated.
Many cultures around the world have their own version of the rainbow story. In some cases these stories include different numbers of colors in the arc. For example, in Chinese culture there are six colors in the rainbow: red, orange, yellow, green, blue, and purple.
The visible light region of the electromagnetic spectrum contains the seven hues of the rainbow (red, orange, yellow, green, blue, indigo, and violet). It has been estimated that visible light accounts for less than 1% of all visible light. It is predicted to account about 0035 percent of the whole electromagnetic spectrum. The other 99+% is made up of radiation in the infrared and radio wavelengths.
Visible light is defined as electromagnetic radiation in the range of 400 nanometers (nm) to 700 nm. This range is called the "visual" or "color" band because it is where we see color. All colors in the rainbow can be seen by humans if they are displayed on a black background using appropriate filters. Red, orange, yellow, green, blue, indigo, and violet - these are the colors of the rainbow.
Red light with a wavelength of 600-700 nm is used in phototherapy (treatment of diseases by exposure to bright light). Blue light with a wavelength of 450-500 nm is used in some lamps for plants.
Infrared radiation is energy beyond the violet end of the visible spectrum.
A basic rainbow always has the colors red, orange, yellow, green, blue, and violet in the order of their wavelength, from longest to shortest: red, orange, yellow, green, blue, and violet. A rainbow is a multicolored arc formed by the collision of light with water droplets. Usually, the sun or another source of light is behind the person who is experiencing the rainbow. The color of the rainbow depends on what color the water droplets are before they collide with the light.
The angle at which sunlight strikes a surface containing water drops will determine how many colors you see in the rainbow. If the drops are small enough, all of the colors of the spectrum will be seen. But as the drop size increases, so does the chance that any given ray of light will be reflected back into your eye instead of being transmitted through it. This happens because water drops larger than about half a micron in diameter reflect most of the light that falls upon them. Rainbow glasses work by reducing the size of the water drops below this critical limit; thus allowing all of the light to pass through to the eye.
Rainbows occur only when it is raining or snowing. When there are no clouds in the sky, only clear weather, then only the blue part of the spectrum is visible. Because the rainbow is caused by water droplets, it can only appear during rain or snowstorms. No rainbow is seen in a clear-sky condition because there are no water droplets to scatter light.
A rainbow is a colorful arc in the sky that may be seen when the light shines through raindrops. The color pattern begins with red on the outer and progresses to orange, yellow, green, blue, indigo, and violet on the interior. A second, bigger, dimmer rainbow is occasionally visible. These arches are formed when light from the sun passes through the droplets of water vapor in the air.
Rainbows are rare sights because clouds usually block out any view of their colors. But when there is no cloud in the sky, you can see them! You might see only part of a rainbow or even just its edge. This happens when there is something between you and the sun blocking out some of the light from it. This could be a mountain, a tree, or even another rainbow.
People have been wondering about rainbows for a long time. Scientists think that maybe early humans used to live in places where there were lots of trees and they wanted to know if those trees made things easier to see at night. They decided to ask some people what they saw during nighttime hours. When they did this several times they found that some people saw colors around stars that were blocked from daytime viewing angles. They called these people "astronomers" because they knew how to find out about the stars.
Today, we still don't know exactly why we see certain colors when sunlight passes through raindrops.
A rainbow, like a circle, is genuinely spherical. It is formed when light from one point outside the atmosphere enters it at exactly 90 degrees (so that it travels straight through without being refracted or bent) and exits again at exactly the same place, so that all parts of its path are equally illuminated. Thus, all parts of the rainbow have the same coloration.
Rainbows are created by sunlight reflected off droplets of water inside clouds. The color comes from the fact that each type of molecule in water has a different way of reacting to light waves. Blue molecules spread out while red ones come together. Yellow molecules are a mix of the two. Green molecules don't even have a single kind of molecule bound up in them. They result from the mixture of red and blue molecules.
Rainbow colors can also be produced when light passes through thin layers of colored glass or plastic. These "rainbows" are called prismatic rainbows. They consist of multiple circles of different colors centered around a single point where all the rays converge. Prisms spread out the light beam into its component colors.
Finally, rainbow colors can be obtained by using dichroic filters.