What is the meaning of the term ''refractive index of a medium''?

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The refractive index of a medium is defined as the ratio of the speed of light in a vacuum to the speed of light in that medium. It describes how light bends when entering a new medium, relating the angle of incidence to the angle of refraction. The term reflects the medium's effect on light propagation. A quick search confirms that the refractive index is a fundamental property of materials affecting optical behavior. Understanding this concept is crucial for applications in optics and photonics.
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My answer is: it is the relationship between the angle of incidence and the angle of refraction.

Is it correct? If not, what should be the correct answer?
 
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In situations like this I generally ask you to use Google to attempt to find the answer first.

A quick Google gives a result of: http://en.wikipedia.org/wiki/Refractive_index
The refractive index or index of refraction of a substance is a measure of the speed of light in that substance. It is expressed as a ratio of the speed of light in vacuum relative to that in the considered medium.

This also answers your other question.
 

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