Physics
Grade-10
Easy

Question

The refractive index of hot air is _____ the refractive index of cool air.

  1. Equal to
  2. Greater than
  3. Smaller than
  4. None of the above

hintHint:

In optics, the refractive index of an optical medium is a dimensionless number that gives the indication of the light bending ability of that medium. The refractive index determines how much the path of light is bent, or refracted, when entering a material. 

The correct answer is: Smaller than


    Since hotter air is less dense than cooler air, hence the refractive index of the hotter air is less than the cooler air.

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