The relative refractive index of a pair of media could be:

= 1

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< 1

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> 1

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= 0

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Solution

The correct option is C $> 1$
Relative refractive index of medium A w.r.t to medium B is the ratio of their absolute refractive index(R.I.)

Let R.I of medium A and medium B be $μ_{A}$ and $μ_{B}$ respectively.

$_{B} μ_{A} = \frac{μ_{A}}{μ_{B}} = \frac{V_{a i r}}{V_{A}} \times \frac{V_{B}}{V_{a i r}} = \frac{V_{B}}{V_{A}} ∴_{B} μ_{A} = \frac{V_{B}}{V_{A}}$
If $V_{B} = V_{A} \Rightarrow_{B} μ_{A} = 1$
If $V_{B} > V_{A} \Rightarrow_{B} μ_{A} > 1$
If $V_{B} < V_{A} \Rightarrow_{B} μ_{A} < 1$
However, it cannot be zero as there is no medium possible with zero absolute refractive index.

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