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edited Apr 13, 2017 at 12:40

The speed of light in vacuum is said to be constant. In a medium, the speed depends on the density of the material, and even on the direction of propagation direction of propagation.

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created Jan 4, 2017 at 16:13

AccidentalFourierTransform

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The speed of light in vacuum is said to be constant. In a medium, the speed depends on the density of the material, and even on the direction of propagation.