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Q: Which of the following medium has the lowest refractive index?
  • A. Petrol
  • B. Oil
  • C. Air
  • D. Diamond
Correct Answer: Option C - The refractive index of a medium is the number that represents how many times the speed of an electromagnetic wave (such as light) in a medium is less or more than that of another medium (vacuum). The density of air is less than that of other given options. Therefore, the refractive index of air will be the lowest.
C. The refractive index of a medium is the number that represents how many times the speed of an electromagnetic wave (such as light) in a medium is less or more than that of another medium (vacuum). The density of air is less than that of other given options. Therefore, the refractive index of air will be the lowest.

Explanations:

The refractive index of a medium is the number that represents how many times the speed of an electromagnetic wave (such as light) in a medium is less or more than that of another medium (vacuum). The density of air is less than that of other given options. Therefore, the refractive index of air will be the lowest.