Seven Colors in a Rainbow and absent colors

People have a joy in seeing Rainbow in the fresh sky after a rainstorm. It looks very pleasing to our eyes. I use to find rainbow in the sky every time after the rainfall. But, what causes a Rainbow? Do you know that? I read in Physics book that a Rainbow has seven different colors. … Read more

Why is the color of Kerosene blue or red?

The colors of Kerosene oil are different in different countries like United States, India, Australia, etc. In India, the Kerosene oil is blue, in United States, it is red and in other countries, the kerosene has different colors. Now, the question is “What is the color of Kerosene oil? Is it blue or red or … Read more