# Who discovered refractive index?

## Who discovered refractive index?

Willebrord Snell
Snell’s law, in optics, a relationship between the path taken by a ray of light in crossing the boundary or surface of separation between two contacting substances and the refractive index of each. This law was discovered in 1621 by the Dutch astronomer and mathematician Willebrord Snell (also called Snellius).

What is the theory of refractive index?

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.

### Who has the least refractive index?

Air has the lowest refractive index. As refractive index of air is 1. Refractive index of water is 1.33. Refractive index of diamond is 2.42.

How do you calculate index of refraction?

How to find the index of refraction

1. Determine the speed of light in the analyzed medium.
2. Divide the speed of light by this value.
3. The obtained value is the refractive index of the medium.
4. You can use this value to calculate the angle of refraction, using our Snell’s law calculator.

## What is the symbol of refractive index?

Refractive index is a material property that describes how the material affects the speed of light travelling through it. Refractive index is usually represented by the symbol n, or sometimes μ .

Which colour has the highest refractive index?

violet colour
The index of refraction varies with frequency, it doesn’t change as light travels from one medium to another, As violet colour has the shortest wavelength and so the refractive index is maximum for it.

### What has a refractive index of 1?

vacuum
The vacuum has a refractive index of 1. The refractive index of other materials can be calculated from the above equation. Higher the refractive index, the higher the optical density and slower is the speed of light.

What causes refraction?

Refraction is caused due to the change in speed of light when it enters from one medium to another. When the light goes from air into water, it bends towards the normal because there is a reduction in its speed.