Most of the particles have different velocity in different reference of frames but why is speed of light the same in all refrence frames? After all light is made of a photon.
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The short answer is that we don't know why $c$ is constant. It is one of the postulates of special relativity:
The speed of light in vacuum is the same for all observers, regardless of the motion of the light source or observer.
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Both special relativity and the constant speed of light have been experimentally verified which leads to the conclusion that $c$ is indeed constant. However, there is no known underlying cause for this.
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