Can the relative refractive index of a medium w.r.t. another medium be

1.	Can the relative refractive index of a medium w.r.t. another medium be less than unity ?
Answer» Yes, for example, the relative refraction index of water w.r.t. glass `= (4//3)/(3//2) = (8)/(9) lt 1`.

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Can the relative refractive index of a medium w.r.t. another medium be less than unity ?

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