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Ok, so, this doesn't mean I can have a light bulb that makes the room dark?

• aortega 14y ago
  You don't need anything fancy like negative frequency light bulb for that, only a regular light bulb that emits light 180 degree phase shifted to the already existing light in the room. It's actually impossible to do with a light bulb because the light that emits is not coherent but you can do it with a laser if the incoming light is also from a laser, in fact negative and positive laser interference is the basis for several technologies such as holograms.