For which of the following media is the absolute refractive index almost equal to one?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. Air.
The absolute refractive index is the ratio of the speed of light in a vacuum to the speed of light in a given medium. Since the speed of light in air is almost equal to its speed in vacuum, the refractive index of air is very close to 1 (approximately 1.0003). This makes air the medium with a refractive index almost equal to one.