A fundamental constant representing the speed of electromagnetic radiation in a vacuum and is approximately equal to 2.9979 × 1010 centimeters per second is known as speed of light.
wave velocity of light in vacuum, c, is the same for all wavelengths of light, but the speed in a material medium is different for different wavelengths. the refractive index of a medium, or (Meu)
u = c / v
where v is the speed of light in the medium. Since v change with the change in the wavelength, or also changes with wavelength.
Relationship between frequency, wavelength and speed.
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