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Ray Optics: Refractive Index Definition MCQ

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Refractive Index DefinitionEasyQuestion 20214

Question

Refractive index n of a medium is defined as:
  1. A
    Speed of light in vacuum / speed in medium
  2. B
    Speed in medium / speed in vacuum
  3. C
    Wavelength in vacuum / wavelength in medium
  4. D
    Both A and C are correct
    Correct

Correct answer

Both A and C are correct

Explanation

n = c/v = λ_vacuum/λ_medium. The frequency doesn't change on refraction; only λ and v change.

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