What is partially polarised light?

(N/A) Partially polarised light is a state of light where the intensity of the electric field vector is not uniform in all directions perpendicular to the direction of propagation,but it is also not completely confined to a single plane.
When unpolarised light is reflected or scattered,the electric field components perpendicular to the plane of incidence and parallel to the plane of incidence are reflected with different intensities.
At the angle of polarisation (Brewster's angle),the reflected light is completely plane-polarised because the component parallel to the plane of incidence becomes zero.
At angles other than the angle of polarisation,both components are present,but one component is stronger than the other.
Since both components are derived from the original unpolarised light and do not maintain a fixed phase relationship,the resulting light exhibits varying intensity when viewed through a rotating analyser,but it never reaches zero intensity. This state is known as partially polarised light.