Question

what is refractive index answer in one word​

Answer 1

Answer:

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

Answer 2

Answer:

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

In optics, the refractive index of a material is a dimensionless number that describes how fast light travels through the material. It is defined as n={\frac {c}{v}}, where c is the speed of light in vacuum and v is the phase velocity of light in the medium.