Yes, it can. Medium has stages, as in, it's not specific. You can't say that there is only a minor, medium, and only bright stages, because there are different levels of such.
Anything that light will penetrate is a medium light will travel through. Any such medium will slow light down, to a certain degree. Window glass slows light down somewhat. Water slows light down a...
Dependence of the speed of sound on the properties of the medium: The speed of sound is variable and depends mainly on the temperature and the properties of the substance through of which the wave is...