As we know that ENERGY HAVE MASS...THEN WHY LIGHT HAVE NO MASS AS IT IS ALSO A ENERGY??
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In addition to being a particle, light is also a wave.
This allows it to carry momentum, and therefore energy, without having mass.
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Light is composed of photons, which have no mass, so therefore light has no mass and can't weigh anything. Not so fast. Because photons have energy -- and, as Einstein taught us, energy is equal to the mass of a body, multiplied by the speed of light squared.
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