Question

Define refractive Index? What are its units​

Answer 1

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The refractive index of a medium is the ratio of the speed of light in vacuum to the speed of light in the medium. It has no units, therefore. This is true also in the context of surface plasmon resonance. RIU is sometimes used to distinguish a number as referring to a refractive index.

Answer 2

Answer:

refractive index have no si units, since from the definition refractive index is the ratio of velocity of light in a material divided with velocity of light in vacuum. ... and that ratio is the refractive index. but there are a lot of expression can described the refractive index. for example in brix percent. ....