Refractive Index Units - What Units are Used to Measure Refractive Index?

[Mattofix]

Refractive Index Units - URGENT -

Homework Statement

Does the Refractive Index of a medium have units. If so what are they? i am needing this for a lab report - so i can quote answers and feel fine that i am not giving any units. I am pretty sure there arent any.

 

[rock.freak667]

No they do not have units as they are a ratio of velocities or wavelengths or sine's of angles.

 

[Mattofix]

thanks