query: Do the mediums decrease or increase the speed of light? (source to target)
positive_passages.docid: 13563
positive_passages.text: What really causes light/photons to appear slower in media?
negative_passages.docid: 65533
negative_passages.text: Does gravity slow the speed that light travels?
negative_passages.docid: 103827
negative_passages.text: Does magnetic propagation follow the speed of light?
negative_passages.docid: 14186
negative_passages.text: Is it possible for information to be transmitted faster than light by using a rigid pole?
negative_passages.docid: 20086
negative_passages.text: Why is the amount of light a lens lets in called the 'lens speed'?
negative_passages.docid: 128965
negative_passages.text: Photon pair production at relativistic speeds?
negative_passages.docid: 56005
negative_passages.text: Speed of light travel
negative_passages.docid: 420
negative_passages.text: Does the pilot of a rocket ship experience an asymptotic approach to the speed of light?
negative_passages.docid: 86328
negative_passages.text: What is the relative speed of two near-light speed particles headed towards each other?
negative_passages.docid: 128327
negative_passages.text: Why does light bend towards the normal when passing from a rarer to a denser medium?
negative_passages.docid: 2154
negative_passages.text: Why doesn't gravity speed up light?
negative_passages.docid: 37421
negative_passages.text: Can a shadow move faster than the speed of light?
negative_passages.docid: 146489
negative_passages.text: What does Lijun Wang's experiment about supraluminal speed of light in a medium mean?
negative_passages.docid: 91300
negative_passages.text: Does light loses its energy when it passes through denser medium?
negative_passages.docid: 32879
negative_passages.text: How does light speed up after coming out of a glass slab?
negative_passages.docid: 10781
negative_passages.text: Accelerating particles to speeds infinitesimally close to the speed of light?
negative_passages.docid: 7618
negative_passages.text: What is the speed of light relative to?