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→Théorème de Bell - La lune existe-t-elle lorsque nous ne la regardons pas ?
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Light can consist of waves that all share the same polarization or have different vibration directions. The left part of Figure 1 illustrates this. There you see a beam of light traveling in a horizontal direction, made up of light waves oscillating in various directions perpendicular to that horizontal arrow. Some types of light, such as sunlight, exhibit all polarizations—that is, they contain waves oscillating in every possible direction within the X-Y plane.[[Fichier:Fonction d'onde.png|centré|358x358px]] | Light can consist of waves that all share the same polarization or have different vibration directions. The left part of Figure 1 illustrates this. There you see a beam of light traveling in a horizontal direction, made up of light waves oscillating in various directions perpendicular to that horizontal arrow. Some types of light, such as sunlight, exhibit all polarizations—that is, they contain waves oscillating in every possible direction within the X-Y plane.[[Fichier:Fonction d'onde.png|centré|358x358px]] | ||
It’s important to note: while a light wave can consist of multiple polarizations, a single light particle or photon can only have one polarization. It vibrates in a single direction. It is the combination of many photons that allows a light wave or beam to exhibit multiple polarizations. This distinction will become important later, when we describe the experiment related to Bell’s theorem. | It’s important to note: while a light wave can consist of multiple polarizations, a single light particle or photon can only have one polarization. It vibrates in a single direction. It is the combination of many photons that allows a light wave or beam to exhibit multiple polarizations. This distinction will become important later, when we describe the experiment related to Bell’s theorem. | ||