Physics
Grade-10
Easy
Question
The refractive index of hot air is _____ the refractive index of cool air.
- Equal to
- Greater than
- Smaller than
- None of the above
Hint:
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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