What is the ratio of the speed of light in a vacuum to a medium?
A. Reflective index
B. Refractive index
C. Mediweek index
D. Air quality index1
C
2
B
3
D
4
A
What is the ratio of the speed of light in a vacuum to a medium?
A. Reflective index
B. Refractive index
C. Mediweek index
D. Air quality index