Why is rainbow seen after rain? After a rainfall, the clouds break and lie hanging in the sky and the sun is also visible. The Sun’s rays, falling on the water drops, are dispersed, totally reflected at the back of the drops and then again refracted into the eye of the observer with his back towards the sun. These dispersed rays which have suffered deviation give rise to a concentrated beam of light indicating all the colours of light. Ice wrapped in a blanket or packed with saw dust does not melt away quickly. Why? Ice wrapped in blanket does not melt, because blanket being bad conductor, cut off heat rays. Saw dust is also a bad conductor of heat. It protects the ice from the external heat and prevents it from melting away. Petrol fire cannot be put with water. Why? Petrol has less density than water. So when water is poured the petrol floats on it and keeps on burning.The temperature of the burning petrol is so high than the water and it would be evapora...
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