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In a vacuum all wavelengths of light travel at the same speed, c. In other mediums the speed of light is dependent on the refractive index of that material; v=c/n where v is the speed through the medium and n is the refractive index. The refractive index if different for different materials and can have fairly complex dependence on the wavelength of light. The fastest type of light is therefore dependent on the medium through which it is travelling.

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