I know that the refractive index of water increases with increased concentration of salt.
But I also read that $$n = \sqrt{\varepsilon_r\mu_r}$$ And that the relative dielectric constant decreases with increased concentration of salt in water.
There seems to be a contradiction as if the dielectric constant decreases then the refractive index must decrease too.
Can someone please tell me where I'm going wrong in understanding this concept?