Question

In which medium, speed of light is the highest?

Answer 1

Answer:

speed of light is highest in the vacuum

Explanation:

Answer 2

Answer:

Explanation:

Light travels faster in vacuum as compared to any other medium. This is because there is no obstruction in the propagation of light in vacuum as there is no matter in vacuum and also, because the refractive index of vacuum is the lowest i.e. equal to unity.