Theelectricfieldcomponentof a lightwavecanoscillateinanydirectionperpendiculartothedirectionoftravel. Lightfromthesunoscillatesinalldirections, wesayitisunpolarised.
Plasmathreadedby a magneticfieldisorderedandtheemittedlightispolarised.
磁場に通されたプラズマは秩序化され、放出された光は偏光する。
Themagneticfieldactsas a polarisedfilter.Thestronggravitynear a blackholebendsthemagneticfieldandtwiststhepolarisationdirectionofthelightfromthesurroundingplasma.