Question

Absolute refractive index can never be less than one.​

Answer 1

Explanation:

• The refractive index of 2 media refers to the ratio of the speed of light in both media. However, absolute refractive index refers to the ratio of speed of light in air/vacuum to the air of light in any other medium.
• The speed of light is maximum in air/vacuum. It is 3 × 10⁸ m/s.
• As the speed of light is maximum in air, the ratio of speed of light in air to the speed of light in another medium is always smaller than 1.

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Answer 2

Explanation:

The refractive index of any material cannot be one, because it is matter, which can be defined as anything that has mass and occupies space. It cannot be less than that of a vacuum, 1, which can be considered as nothing.