Question

Define refractive index.​

Answer 1

Answer:

Definition of refractive index : the ratio of the speed of radiation (such as light) in one medium (such as air, glass, or a vacuum) to that in another medium Examples of refractive index in a Sentence Recent Examples on the Web For these wavelengths, most materials have a refractive index that is just very slightly less than one.

Explanation:

Answer 2

Explanation:

the refractive index of a material is a dimensionless number that describes how fast light travels through the material. It is defined as where c is the speed of light in vacuum and v is the phase velocity of light in the medium.