Rainbow:-

The rainbow or the induction is a visible arcade line of light which is caused by reflection and refraction of sunlight in the atmosphere in the atmosphere. Normally after rain , there is a rainbow on the opposite side of the sun in the sky . There are seven color combinations in Rainbow. Seeing it is bent like a bow , its name is Rainbow.

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History :-

The first scientific interpretation of the causes of Ramdhnu's channel and its presence is given by the famous Greek philosopher and scientific Aristotle . He realized that the birth of this 'Ramdhanu Rashmi' was due to the reflection of the light of the sky in a particular corner of light. Since this is the rainbow created due to the presence of our eyes through some 'special' light from the sky, it also gives the explanation of the rainbow (or round) of the rainbow. The thing is this: Since the rainbow rays are scattered in a particular corner, they all together create a light cone (actually a cone for each color) in the sky, which has a circle perpendicular cross-section. If we see the rainbow then the torch of the torch!

Around 17 centuries after Aristotle's interpretation, in 1304, a scientist, Theodoric of Freiberg, argued this theory and gave a new argument. The tanks do not need a combination of clouds of water in the sky, a rainbow is enough for the birth of the rainbow! The monk did not stop at the end of the theory only, but in fact, whether it was the water of the glass round to see whether it was at all, he also identified the path of ammunition (why would he know the glass sphere? That would be a deliberate water dispute!). But sadly, his work is unreadable, and about three centuries later, Descartes) Repeat the rules using the same method. Both Theodoric and Dictate showed that the rainbow was born to reflect the light inside the water dispute; Once the inner reflection of the light gets out of the initial rainbow and the internal reflection of the intermediate rainbow! Since the water source absorbs a bit of light in every reflection, the luminosity of the secondary is less than initial. The document also saw that only one color can be seen on any direction between the angular range of the rainbow, from which he came to the conclusion that for each color of the rainbow, different water bodies contributed.

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Explanation:-

When the sun's light goes through the rain particles or water vapor- mixed air, the spectral occurs due to the reflection of light . The light in this spectrum is divided into seven colors. These seven colors are violet, indigo, blue, green, yellow, orange and red; In Bangla, these colors are summarized in their initials: VIBGYOR in BeniAsakala and English

Reflection and refraction of the initial analysis of the Ramadhunu was based on these two principles. Now for the benefit of analysis, let's assume that floating water bodies in the sky are rounded.

The only thing that is now considered is the perpendicular distance from the center of the sphere. This distance is called the impact parameter, in the terminology of science. If the light bulb penetrates the center of the sphere, then its impact parameter is zero. And if it comes out by touching the sphere, its impact parameter is equal to the radius of the sphere (it is also the highest value of the impact parameter).
If the sunlight is coming up on the water, the value of their impact parameter is zero, which is possible in the diamond radius. And then, the scattered rays of scattered rays can take any value between zero and 180 °. If you can see only the rainbow in a special corner of the sky why? Theodore did not think of it. The first answer to this question is to Deckart.

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See the picture next to it - By putting very simple geometry, we wrote an equation to find out the scattering angle or scattering angle, δ. According to this equation, know the value of the distortion angle and the value of the angle of refraction will be known.

By changing the value of the impact parameter according to the side picture, that means when the light rays hit the water source, the value of the angle or i will be changed (given in the equation picture). As a result , the quality of the refractive angle or r will also change. That means changing the impact angle will change the scatter angle. For example, if the expected light emission parameter is zero, then the value of the distortion angle is 180 °, that is, the reflected light bulb returns back to the point where it came straight from.

In the case of primary rainbow, it was found that the impact of the impact angle decreased with the increase of impact parameter, but after a while it started to grow again! That is, there is a minimum value of the distortion angle; It is estimated that this minimum value is 138 °. If the impact parameter is 7/8 percent of the radius of the water dispute, then the scope of the screw angle stands.

These scattering values ​​are really different for different colors. And there is the creation of the rainbow-mystery! For a little more convenience to understand, the table below shows the scope of the scales for the different values ​​of the angle i , just for the purplish light. Purple color refractive for water 1.340

Debate:-

In the year 2016, in the division of West Bengal, the section of the class-class environment and science book titled "Varnaali" has been written by Ramdhnu in the section. One of the colors of the rainbow is written as 'Asmani'. In the school book syllabus secular, syllabus princesses gave a complete level of controversy. Dashratha's son is associated with the term 'Ramdhnu'. The King of Ram is a Hindu priest. The social media is also bolstered.

However, Chairman of the syllabus committee, Mr. Abik Majumdar said, there is no relation to Rampadhunur. Modern writers referred to it as rainbow. Even his greatness is written by Mahashweta Devi and Rangdhunu. He also said, Rainbow is written in some of the first class books. It has been there for a few years now.

But there is complete disagreement in this regard, Professor of Bangabanga University , Bangabanga University , Jadavpur University , former Vice Chancellor, Achintya Biswas. He said, my students are impractical. Do not know why it's said. But there is one kind of strategy. I see it as language-terrorism. A committee led by Mohammad Shahidulla made a number of such recommendations under the direction of the government of Pakistan . They bring the word voodoo instead of annexe. The soul revolves around 'the soul' But where are these spelling rules introduced in this state? One of my students was asking, Will Ramachalagala be called Rangachalag? The word 'Dhanu' does not change even if there is a similarity to Ram's broken harpoon.

Where is the Bengali professor Sheikh Rafiqul Hossain of Calcutta University, "If the rainbow is changed to Bangladesh, then it may have been trying to get rid of Rama, but in our West Bengal, rainbow is very popular, rainbow is absolutely unfamiliar, so the debate is on to try this rainbow. So, we need to change it suddenly, but we do not see it. "

As a result of this initiative against the communalism of the state government, it is seen from Netizen that a large part of the educationists.

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