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causality - Why group speed can contain information but phase speed can't? - Physics Stack Exchange

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I was watching sixty symbol on YouTube about reflective index and learnt that it is the sum of all the speed of light or phase speed that appears slower than speed of light in the medium, and also ...

causality - Why group speed can contain information but phase speed can't? - Physics Stack Exchange Stack Internal Knowledge at work Bring the best of human thought and AI automation together at your work. Explore Stack Internal Why group speed can contain information but phase speed can't? Ask Question Asked 8 years, 3 months ago Modified 2 years ago Viewed 1k times 4 $\begingroup$ I was watching sixty symbol on YouTube about reflective index and learnt that it is the sum of all the speed of light or phase speed that appears slower than speed of light in the medium, and also the phase speed c

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