Question

A light beam has speed c in vacuum and speed v in a certain plastic. The index of refraction n of this plastic is

1.n = cv
2.n = c/v
3.n = (v/c)^2
4.n = (c/v)2
5.n = v/c

Answer 1

The index of refraction of a material can be calculated from the speed of light in that material using the equation n = c/v, where n is the index of refraction, c is the speed of light in a vacuum, and v is the speed of light in the material.

Step-by-step explanation:

The index of refraction of a material can be calculated from the speed of light in that material using the equation n = c/v, where n is the index of refraction, c is the speed of light in a vacuum, and v is the speed of light in the material.

So, in this case, if the speed of light in the material is v, the index of refraction would be n = c/v.

Therefore, the correct answer to your question is option 3: n = (v/c)^2.