- 1 How Rainbow occurrence
- 2 colors consisting of rainbow
- 3 arc definition of rainbow
- 4 References
How Rainbow occurrence
Formation process begins rainbow when it radiates sunlight on the water drop, when entering the sun's rays to the water drop below its speed slightly because more dense than air water, causing the curvature of the light path or break it, and when the beam enters the light into the water drop and bend it separated into its components of wavelengths colored (which appear white when combined together), and continues to light in the course inside a drop of water even reflected in the back of the drop, and then come out from the opposite her side at an angle 42 degrees, when the exit light, which is still separate colors to a group consisting his speed is increased when the move again in the air less dense, and broken again down to the viewer's eye, and apply to all water droplets in the sky we get a full arc rainbow. 
Constituent colors of the rainbow
Rainbow Katif shows from a range of familiar colors, and show these colors in the following order: red, then orange, then yellow, then green, then blue, then indigo, and violet, and has a red color longer wavelength in the visible light, which is a 650 nanometers , usually it appears on the outer part of the rainbow, while the color violet has a shorter wavelength, which is 400 nanometers, usually appears on the inner arc of the rainbow, and on the edges of the rainbow arc colors overlap rainbow and overlap; Which produces a brightness of white light, which makes the inner part of the rainbow brighter than the outer part of it. 
Visible light constitutes only part of the rainbow, featuring a rainbow also infrared located behind the red visible light, and no UV behind the violet color, and there are radio waves behind the infrared, X-rays behind the UV, gamma behind the X-rays ray, scientists used to study these parts are not visible from the rainbow tool known as spectrographs. 
It can be defined as the rainbow as a series of arches colored concentric that can be seen when the fall of light from a specific source is usually the sun on a set of water droplets, such as: rain, or fog, or spray, which is usually seen in the opposite direction of the sun, and more types of arc rainbow common and most brightest is the arc primary rainbow resulting from the light that leaves the water drop after an internal reflection of one, and sometimes secondary rainbow least arc shows the unit of the main arch, which has the sequence of colors opposite rainbow primary, which is produced from Anekasin internal light inside the water drop. [ 3]
- ↑ Tiffany Means (7-3-2017)، "Sun and Rain: A Recipe For Rainbows"، www.thoughtco.com، Retrieved 7-12-2017. Edited.
- ^ أ ب "rainbow"، www.nationalgeographic.org، Retrieved 7-12-2017. Edited.
- ↑ The Editors of Encyclopædia Britannica، "Rainbow"، www.britannica.com، Retrieved 7-12-2017. Edited.
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