explain about refractive index.
Answers
Refractive Index (Index of Refraction) is a value calculated from the ratio of the speed of light in a vacuum to that in a second medium of greater density. The refractive index variable is most commonly symbolized by the letter n or n' in descriptive text and mathematical equations.
Explanation:
In optics, 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
n=c/v
where c is the speed of light in vacuum and v is the phase velocity of light in the medium.
For example, the refractive index of water is 1.333, meaning that light travels 1.333 times slower in water than in a vacuum.
Increasing the refractive index corresponds to decreasing the speed of light in the material.