Question

What is Refractive Index ??

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Answer 1

Answer:

In optics, the refractive index (also known as refraction index or index of refraction) of a material is a dimensionless number that describes how fast light travels through the material

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Answer 2

noun: refractive index; plural noun: refractive indices

the ratio of the velocity of light in a vacuum to its velocity in a specified medium.