Polarisation

Any thing which is normal as per the nature’s requirement is unpolarized. Polarization is the state of a system which is under a force because of an external agency which looks to be more systematic and conditioned compared to the natural state. Is it not right to wonder under the state of polarization the system is under strain!!!? The greatest inference the polarization of light has given is not only that light is a transverse wave, it is an electromagnetic wave.
Different types of polarizations like Circular polarization, Elliptical polarization etc are possible through the combination of plane polarized light which can be achieved through different methods like use of Nicole prism, polaroiders etc.,

de-Broglie’s hypothesis

The experiments on intereference, diffraction and polarization in light infer that light behaves as waves. While the Photoelectric effect infers that the light at the time of interaction show that they behave as quanta( particle) .
The X- rays through the process of diffraction show that they are waves, while the same X-rays show that they are scattered as if they are particles following the law of conservation of energy.
The above two examples clearly talk of duality of electromagnetic radiation.