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The speed of light is a fundamental universal constant that marks the maximum speed at which energy and information can propagate. Its value is $299792458\frac{\mathrm{m}}{\mathrm{s}}$.
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Do electromagnetic waves really slow down? [duplicate]
I have read somewhere that electromagnetic waves, when refracting only "appear" to slow down. That is when the wave goes thorough a material like glass it vibrates the electrons in the glass which gen …