Abhivyakti

A rainbow is a multi-coloured arc that appears in the sky as a result of bending and scattering of sunlight through drops of rain. It occurs when it is raining in one part of the sky and sunny in another. A rainbow cannot be approached or physically touched. On ground, we only see a semi-circle or arc of rainbow, though it’s a full circle of light.  However, from height such as on an airplane, it can be seen in a complete circle. Due to its bow like shape and being formed mainly in rains, it is called as rainbow. Sir Isaac Newton explained how a rainbow forms. He identified 7 colours that make up white light of Sun. These 7 colours are Violet, Indigo, Blue, Green, Yellow, Orange and Red (VIBGYOR). All these colours are present in a rainbow in the order red, orange, yellow, green, blue, and indigo and violet. Normally when sunlight travels through the air we see white light. But when it enters through a raindrop, colours separate to make a rainbow at 42 degrees from the d...

If one thing around us changes every day, it is possibly the weather. One fine day it is pleasant, another day it is rash. Some days are warmer, while some days are cooler or rainy. Ever thought why it happens. Come! Let’s discuss. Our planet, “The Earth” revolves around “The Sun”, the only star of our solar system. The changes in weather are caused by the sun. Sun gives us light and heat. But the amount of heat received from sun is not same everywhere on the earth, as our earth is tilted on it axis. This heat is absorbed in the atmosphere of earth. Due to this, air in our atmosphere becomes warm. Air near the equator (line which divides the earth in two equal parts) is warmest as it gets more heat than any other parts of atmosphere. On the other hand, north and south poles are cold due to being the farthest points on earth. It means air is hot on some parts of the earth, while cold on other parts. Air warmed by the sun becomes lighter and rises upwards in a warm place. Opposite ...