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Q: The refractive indices of mediums 1, 2 and 3 are 1.46, 1.65 and 1.31, respectively. If the speed of light in the mediums are v₁, v₂ and v₃ respectively, which of the following relations between them is correct?
  • A. v₃ > v₁ > v₂
  • B. v₂ > v₃ > v₁
  • C. v₁> v₂> v₃
  • D. v₁= v₂ = v₃
Correct Answer: Option A - Refractive index of the medium is inversely proportional to the speed of light in it. As the refractive index of medium increases the speed of light passing through it decreases. Thus v₃ will be highest followed by v₁ then v₂.
A. Refractive index of the medium is inversely proportional to the speed of light in it. As the refractive index of medium increases the speed of light passing through it decreases. Thus v₃ will be highest followed by v₁ then v₂.

Explanations:

Refractive index of the medium is inversely proportional to the speed of light in it. As the refractive index of medium increases the speed of light passing through it decreases. Thus v₃ will be highest followed by v₁ then v₂.