A 'medium' can really be anything. In physics we usually talk about waves traveling through a medium, which basically means that waves are travelling through a material.
We can probably just replace the words 'a medium' with 'something'. That 'something' can be anything.
Air, water, glass, metal, rock; any of these could be a medium. The only thing that cannot be a medium is nothing, i.e. a vacuum.
Side note: plural of 'medium' would be 'media'.
physics
No, only mechanical waves (transverse or longitudinal) require a medium. I learned this a few weeks ago in Physics 20
RAMAN EFFECT
Two waves that do not require a medium to travel would be light waves and gravitational waves. - Zach Harris, B.S. Physics
The physics acronym TOF means "time of flight". This refers to the time it takes for an object, particle or wave to travel a distance through a particular medium.
the return of light into the same medium after striking a surface is called reflection. ruchi
the maximum distance that a charged particle, as a proton, can penetrate a given medium and still maintain sufficient kinetic energy to produce ionization in the medium. Souce: http://dictionary.reference.com/browse/Range
The disturbance traveled from one end to the other end in a medium without the acutal moment of particle is called wave motion.
It is the conversion of the energy of electromagnetic radiations, sound, streams of particles, etc.into other forms of energy on passing through a medium.
Electromagnetic waves (like light) don't require a medium for propagation, unlike mechanic waves (like sound).
physics is related to optical illusions as the bending of rays in certain fashion will create virtual images that really do not exist thus causing you to see illusions. this can be caused due to the change in medium through which the light travels.
standing wave