Q: The constant "c" can be specifically used to represent the (extremely fast) speed of what?


Read this paragraph and choose the correct option from the provided answers:

n = cv , where v is the observed speed of light in the material. Since the speed of light is always less than only in a vacuum, the index of refraction is always greater than or equal to one.

 Choices:

- electricity

- sound

- gravity

- light


A:
light