Question

define refractive index​

Answer 1

Explanation:

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

Answer 2

Answer:

The ratio of the speed of light in a vacuum to its speed in a specific medium is called refractive index.

Explanation:

Refractive index is also referred to as refraction index or index of refraction. The speed of light in a medium depends on the properties of the medium. In electromagnetic waves, the speed is dependent on the optical density of the medium. Optical density is the tendency of the atoms in a material to restore the absorbed electromagnetic energy. The more optically dense material is, the slower the speed of light. One such indicator of the optical density of a medium is the refractive index.