RAINBOWSunlight is a polychromatic light (consisting of many colors). The white color of sunlight is actually a combination of various light with different wavelengths. The human eye is able to perceive at least seven colors of sunlight, which will be seen in the rainbow: red, orange, yellow, green, blue, indigo and violet. This wavelength of light forms a ribbon of parallel lines, each nuanced color with a color next to it. This band is called the color spectrum. In the color spectrum, the red lines are always on one side and blue and violet on the other, and this is determined by the difference in wavelength.

Rainbow is a natural phenomenon that is so impressive. This phenomenon often appears after rain. Rainbow is an arc spectrum which is so large and occurs because the drops are refracted by sunlight. When the sun is shining and the light passing through water droplets, then you will see a refraction that causes a wide variety of colors. Light is refracted like light passing through a glass prism.

How does rainbow happen in detail? All the happenings begin when the sunlight passing through the raindrops. Then the light is deflected to the center of the droplet. The white light, now separated from each other into a spectrum of colors. The process does not stop there. The colors that have been separated, then separate again into the very small portions. There is more light separated from each other in the droplets. Then there are more curved and finally those color form a light curve called a rainbow.

Rainbow is nothing but an arc of a large circular spectrum of color that occurs due to refraction of sunlight by water grains. When sunlight passes through water droplets, it refracts like when it penetrates a glass prism and comes out into a rainbow color spectrum. So inside the water droplets, we have got different colors lined up from one side to the other. Some of this colored light is then reflected from the far side of the water droplets, returning and exiting again from the water droplets. Light comes back from water droplets in a different direction, depending on the color. The colors on this rainbow are arranged in red at the top and purple at the bottom of the rainbow.

Rainbow is seen as a bow from the surface of the earth because of the limited viewing angle of the eye, if the vantage point in a high place, for example from an airplane, can be seen as a complete color spectrum in the form of a circle. The rainbow can only be seen when it rains together with the sun shining but from the opposite side of the observer. The position of the observer must be between the sun and the droplets of water with the sun behind the person. The sun, the eye of the observer, and the center of the rainbow arc must be in a straight line.

Can we make a rainbow? Of course. There are at least two ways that you can do to make a rainbow. First, you can use a spray containing water. We know that rainbows occur when sunlight passing through the raindrops. So, we make our own rain droplets from the water spray. In the morning or afternoon, spray water under the sun, then see the water droplets flying. Spray lots of water and you will see a small rainbow that you can touch easily.

Second, use pieces of video discs then reflected the light of the sun, and navigate to the wall or ceiling of your house. On the ceiling or the wall, you will see a colorful light that has the same color as the rainbow.

That’s the definition of rainbow, how does it happen, and how we can make it true.

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