The Refractive index of a medium is an important topic of optics or the Light chapter of physics. Solving the numerical problems from this chapter is also a must if we want a good grasp on chapters like the Refraction of light.
We use a number of formulas to solve these problems related to RI or ARI (Absolute Refractive Index).
Here I am going to provide you some important links or URLs that will take you to online tutorials on RI and Numericals on RI.
I believe these articles or posts are going to benefit you if you are serious to learn.
Now here are the links:
Refractive Index — Concepts & formula (read this before solving the numerical)
As you read all these tutorials, please share the links with others as well. Wish you HAPPY READING.