In this work, we proposed a simple model for control of optical properties via an externalmagnetic field in a vee-type degenerated atomic medium. By numerically solving the densitymatrix equations in the steady-state, we show that the absorption and dispersion properties areinfluenced by the strength of coupling laser and external magnetic fields. Furthermore, it isfound that in the presence of an external magnetic field, a medium can be switched fromtransparent to absorption, which corresponds with subluminal and superluminal lights. Thesuggestions scheme may be useful in the applications of magneto-optic switches and magnetooptic storage devices in processing telecommunication signals.Keywords Electromagnetically induced transparency, absorption, dispersion, subluminal andsuperluminal light, magnetic-optical switching