Index of refraction and density

[bgq]

Hi,

Is it possible that the medium of lesser density has larger index of refraction? If yes, please give me some examples.

Thanks in advance.

 

[Abhilash H N]

Actually as density inceases refractive index also increases, although there is no specific relation between the two. But many oils like olive oil, have relatively more refractive index but having low density when copared to water... This is one wikipedia link, you might find what you need...
http://en.wikipedia.org/wiki/Refractive_index