Multiple choice general knowledge

Refractive index of a medium is equal to : ( c = speed of light in vacuum, v = speed of light in the medium )

  1. c / v

  2. v / c

  3. c * v

  4. c + v
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A Correct answer
Explanation

Refractive index (n) is defined as the ratio of the speed of light in vacuum (c) to the speed of light in the medium (v): n = c/v. This makes sense because light slows down in denser media, giving higher refractive indices. The other options (v/c, c*v, c+v) don't represent the physical definition.

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