Differentiate between polarised and un-polarised light. How are these represented ?

Explanation

In polarised light vibrations of electric vectors are taking place in a particular plane only but in unpolarised light vibrations of electric vector take place in all possible directions perpendicular to the direction of propagation of light.
Figure represent unpolarised light. Figure represent plane polarised light with plane of paper as the plane of vibration. Figure also represent plane polarised light but its plane of vibration is perpendicular to the plane of paper.