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For which of the following media is the absolute refractive index almost equal to one?

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  1. Water
  2. Air
  3. Ice
  4. Kerosene

Answer (Detailed Solution Below)

Option 2 : Air
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Detailed Solution

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The correct answer is Air.

Key Points

  • Refractive Index of a medium: 
    • It tells the capacity of the medium to bend a light ray when it passes through.
    • The Refractive index is inversely proportional to the speed of the light.
    • It is a dimensionless quantity.
  • The absolute refractive index of a medium:
    • It is expressed as the ratio speed of light in vacuum to the speed of light in the medium.
    • It is a comparison of the speeds of light of different media.
    • The speed of light in air is almost equal to the speed of light in a vacuum. So, absolute refractive index, μ = c / c = 1.

Additional Information 

Medium Absolute Refractive index
Vacuum 1
Air 1.007
Ice 1.31
Water 1.33
Kerosene 1.44
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