Light is said to be "plane polarized" (figure
3
) when the electric field associated with it travels in the same plane. Of course, the magnetic field remains in a plane perpendicular to the previous one. The term "rectilinear polarization" is sometimes used.
Unpolarized light, such as so-called "natural" light, is made up of lights randomly polarized in all directions (figure
4
); each successive wave moves in a different plane.
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