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Q: The ratio of the speed of light in a medium to a vacuum is called ........
  • A. Reflective index
  • B. Refractive index
  • C. Medivec Index
  • D. Air Quality Index
Correct Answer: Option B - The ratio of the speed of light in a medium to a vacuum is called a refractive index. The refractive index of a medium is a number that tells how many times the speed of the electromagnetic wave in that medium is less or more than that of any other medium.
B. The ratio of the speed of light in a medium to a vacuum is called a refractive index. The refractive index of a medium is a number that tells how many times the speed of the electromagnetic wave in that medium is less or more than that of any other medium.

Explanations:

The ratio of the speed of light in a medium to a vacuum is called a refractive index. The refractive index of a medium is a number that tells how many times the speed of the electromagnetic wave in that medium is less or more than that of any other medium.