what is the difference between velocity of light & Speed of light
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That is because speed is a scalar and velocity is a vector
- . Speed has just magnitude.
While velocity has magnitude( which is speed) and direction.
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The speed of light is constant. The velocity of light should be, unless light changes direction. Speed is the magnitude of velocity, a scalar quantity (has size, but not direction), whereas velocity is a vector, which has both magnitude and direction. c is defined as speed, which has only magnitude.
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