Question

67)…………this is the unit of refractive index.

a) cm b) m c) degree d) refractive index has no unit​

Answer 1

Unit of refractive index (μ) will be the ratio of the unit of speed of light in vacuum(c) to the speed of light in the given medium(v). As you can see, the unit of refractive is 1, which means the refractive index is just a number without any unit.

hence option d )