A chick hatching from an egg. The chicken or the egg causality dilemma is commonly stated as which came first: the chicken or the egg?. The dilemma stems from the observation that all chickens hatch from eggs and all chicken eggs are laid by chickens.
Unpolarized light can also become polarized when it is scattered in air (also known as Rayleigh scattering). This occurs due to the fact that the EM waves cause the electron in air to vibrate, producing radiation and causing polarization of the light.
Why does it happen? The simple answer is that light is a wave and reflecting, bouncing off certain other materials while retaining the same wavelengthâ¦sometimes, is just what waves do. A more detailed explanation is that the energy in light, photons, activates the electrons in some materials, causing them to move and emit photons likewise.