Circular and Elliptically Polarized Light

How do you make a circular polarization?

What is polarization of light in physics?

What is light circular polarization?

If the phase difference between two rays is $\raisebox{1ex}{$\mathrm{\pi }$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$ and the angle of incidence is equal to $\raisebox{1ex}{$\mathrm{\pi }$}\!\left/ \!\raisebox{-1ex}{$4$}\right.$. The emergent light is

The direction in which the electric vectors oscillate in a polarized wave is called as-

A linearly polarise wave is always 

Cotyledons are also called-