Question

What is the unit of refractive index? *

1 point

no unit

candela

lux

m/s​

Answer 1

Answer:

The refractive index of a medium is the ratio of the speed of light in vacuum to the speed of light in the medium. It has no units, therefore.

There is no SI units for refractive index, since it is a ratio of light velocity in material vs light velocity in vacuum, all velosity units have been cancelled out and the only thing left is the number that shows the ratio.