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

Focal length of a concave mirror – theory and experiment

Spherical mirror has two types – Concave mirror and Convex mirror. In this article, we are going to discuss the focal length of a concave mirror. Though, the focal length of both types of mirror has same definition and units, but the signs of focal length are different for these two mirrors. Here, we have … Read more

How to find refractive index of a material? [ 4 ways]

In another article, we already have discussed the refractive index of a material and most of the facts related to refractive index. The value of the index of refraction is different for different materials. So, we need a process to know or calculate the refractive index of different materials. In this article, we are going … Read more

Refractive index – definition, formula, dependence, List

In the chapter of refraction of light, we became to know that the light bends while passing from one medium to another medium. Even this fact can be seen in daily life also. Now, the question is, why light bends when it changes medium? This is due to different refractive indices of different medium. In … Read more