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what is the equation for the speed of light in a vacuum. The ratio of the speed of light in the vacuum with the speed of light in the medium is equal to the refractive index. The speed of light in vacuum is constant for every observer independent of the movement of the lights sources.
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Therefore light does not only travel at the speed of electromagnetic waves it is an electromagnetic wave. Thats over 186000 miles per second. What is the equation for.
The physical meaning of this value is the speed of the propagating electromagnetic wave.
Displaystyle v sqrt frac 1 mu _ 0epsilon _ 0approx 3times 10 8 text m s -1 The expression on the right happens to equal the speed of light. When light enters a denser medium like from air to glass the speed and wavelength of the light wave decrease while the. From this he was the one to drop the ether hypothesis. Therefore light does not only travel at the speed of electromagnetic waves it is an electromagnetic wave.
