Abstract: We demonstrate that the susceptibility tensor X exists certainly the non-opposite angle symmetrical conjugate imaginary elements in terms of the light wave equation when the medium is the rotatory medium. The relation of ordinary index of refraction no between the left-handed light refractive index n h and the righthanded light refractive index nR is derived from the gyrotropic crystal. The result is consistent in the theoretical analysis with the experimental data.

Key words: gyrotropic crystal, ordinary index of refraction, left-handed light refractive index, right-handed light refractive index