Whenever a light ray interacts with a surface or a medium, three outcomes are possible. These are reflection, absorption and refraction. The probability of any of these outcomes depends upon the nature of the surface or medium through which it interacts, nature of medium being with respect to the opaqueness of the medium.
In opaque objects, the maximum part of the light is absorbed by the surface and the remaining part gets reflected off the surface. In transparent mediums, maximum light gets through the medium and gets refracted, the remaining part of light rays partly get reflected and absorbed. Translucent mediums are something between that of transparent mediums and opaque