The refractive index of medium B with respect to medium A is greater than 1. What does it imply?

$\mathrm{Refractive} \mathrm{index} \mathrm{of} \mathrm{a} \mathrm{medium}=\frac{\mathrm{speed} \mathrm{of} \mathrm{light} \mathrm{in} \mathrm{air} \mathrm{or} \mathrm{vacuum}}{\mathrm{speed} \mathrm{of} \mathrm{light} \mathrm{in} \mathrm{the} \mathrm{medium} }$

• The Refractive index is inversely proportional to the speed of light in the medium. Therefore, the more the refractive index, the lesser the speed of light in the medium.
• If the refractive index of medium B w.r.t medium A is greater than 1, then the speed of light in medium B must be less than the speed of light in medium A.

Therefore, 'speed of light in medium B < speed of light in medium A' is the correct answer.