Polarised waves oscillate in one plane only. Light from a filament light emits waves in many planes. The oscillation are always 90 ° to the direction of energy transfer. It is possible to plane-polarise transverse waves and block waves with oscillations in all but one plane. This can be done with a polarising filter or polaroid. 
It is not possible to polarise longitudinal waves because the direction of the oscillations is always parallel to the direction of energy transfer. When transverse waves reflect off a surface, they become partially polarised. The wave is not completely polarised. Most of the light reflected off the surface of water is horizontally polarised.
It is not possible to polarise longitudinal waves because the direction of the oscillations is always parallel to the direction of energy transfer. When transverse waves reflect off a surface, they become partially polarised. The wave is not completely polarised. Most of the light reflected off the surface of water is horizontally polarised.