Question

The ratio of speed of light in vacuum to speed of light in that medium is called

Answer 1

HEY ! ..... here's your answer

Explanation:

Index of refraction

Answer 2

Answer:

It is known as the refractive index.

Explanation:

Refractive index:

• The refractive index is defined as the difference between the speed of light in a vacuum and that in a medium. The atoms of a medium other than the vacuum constantly absorb and reemit light particles, slowing down the speed of light while it travels through that medium.

The refractive index comes in two varieties:

• The ratio of the speed of light in one medium to the speed of light in another is known as the relative refractive index.

• The difference between the speed of light in a vacuum and the specified medium is known as the absolute refractive index.