define refractive index??
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Answer:
the refractive index (also known as refraction index or index of refraction) 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.
The ratio of the velocity of light in a vacuum to its velocity in a specified medium and in optics the refractive index of a material is a dimensionless number that describes how fast light travels through the material and it is defined as where c is the speed of light in vacuum and v is the phase velocity of light in the medium. Refractive index also called index of refraction measure of the bending of a ray of light when passing from one medium into another and refractive index is also equal to the velocity of light c of a given wavelength in empty space divided by its velocity v in a substance or n = c/v.