query: When light changes medium, does it decelerate, or instantaneously change speed?
positive_passages.docid: 20037
positive_passages.text: Do photons have acceleration?
negative_passages.docid: 57608
negative_passages.text: Approaching speed of light: why do objects appear further away in front of me?
negative_passages.docid: 117653
negative_passages.text: How does light travel?
negative_passages.docid: 139551
negative_passages.text: A Light is shone out the side window of a spaceship ( moving close to light speed ), will the light still travel at the speed of light in the B axis?
negative_passages.docid: 45888
negative_passages.text: Minkowski metric -- why does it follow from the constancy of the speed of light?
negative_passages.docid: 37941
negative_passages.text: Can light travel slower than the maximum?
negative_passages.docid: 90147
negative_passages.text: Do light experience Doppler shift along and against frame dragging?
negative_passages.docid: 12267
negative_passages.text: (Almost) double light speed
negative_passages.docid: 13563
negative_passages.text: What really causes light/photons to appear slower in media?
negative_passages.docid: 19850
negative_passages.text: Why is the speed of light defined as 299792458 m/s?
negative_passages.docid: 974
negative_passages.text: Speed of light in a gravitational field?
negative_passages.docid: 132106
negative_passages.text: Why does the speed of light $c$ have the value it does?
negative_passages.docid: 156818
negative_passages.text: Doppler Shift when Light Travels Through Two Different Mediums
negative_passages.docid: 120679
negative_passages.text: Rømer's determination of the speed of light
negative_passages.docid: 77372
negative_passages.text: "Speed" of Gravity and Speed of Light
negative_passages.docid: 153586
negative_passages.text: What is the best scientific explanation for how The Flash moves so fast without issue, or is it just "magic?"
negative_passages.docid: 72913
negative_passages.text: Why does a light wave fade as it travels through space?