A student when discussing the properties of a medium (except vacuum) writesVelocity of light in vacuum = Velocity of light in medium This formula is

The formula can be written as Velocity of light in vacuum  Velocity of light in medium =1This formula is dimensionally correct as both the sides are dimensionless. Numerically, this ratio is equal to refractive index which is greater than 1. Hence, the equation is numerically incorrect.