This lecture is about refractive index in physics. In this animated tutorial.

Q: What is refractive index?
Ans: The ratio of speed of light in a vacuum to the speed of light in a specific medium is called refractive index. One can also say that refractive index measures the optical density of a medium. For example, the refractive index of a glass is 1.5. It shows that the speed of light in a glass is 1.5 times slower than the speed of light in a vacuum.

To learn more about refractive index, watch this animated lecture till the end.

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