Behind the Beauty (task 3)

All of us absolutely agree that rainbow is a beautiful meteorological phenomenon. However, I am sure that most of us do not know about something behind the beauty of rainbow.

Rainbow needs a long way of process before it does appear. Basically, the idea is very simple; it is about the sunlight that faces some moisture elements in the sky. Now, I will tell you the process in details. The first is the reflection process of sunlight that actually has white colour. In scientific world, it is called polychromatic character of the sunlight and it consists of seven monochromatic (one wavelength light) light. Then, the light spreads out into seven base colours; usually people call it as a spectrum, those are, in chronological order, red, orange, yellow, green, blue, indigo and purple. Red always appears in the outer side of the rainbow. I have found the explanation of this case in wikipedia.org, the website states that the amount by which light is refracted (reflected) depends upon its wavelength, and hence its colour. Blue light (shorter wavelength) is refracted at a greater angle than red light, but because the area of the back of the droplet has a focal point inside the droplet, the spectrum crosses itself, and therefore the red light appears higher in the sky, and forms the outer colour of the rainbow. The next question must be why it can be spread into seven different colours? Because each monochromatic colour has different frequency, it has different colouring effect result when each of light spreads out and breaks the reflection medium. The medium of sunlight reflection that creates the rainbow is water. It usually takes form in rain. Yet, rainbow is not only caused by rain but it is caused by others form of water also, such as mist, spray, and dew. The rainbow that comes from those elements is commonly seen near waterfalls or fountains. The effect can also be artificially created by the same process as the process of an ordinary rainbow in the sky, but this phenomenon usually can be seen only in a sunny day.


After being reflected by water and/or other forms, finally, sunlight will show the combination of seven spectrum colours in a form of a multicoloured arc, with red on the outer part of the arch and violet on the inner section of the arch. Thus, people call it as a rainbow.

taken from many sources

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