Why is the speed of light in vacuum constant?
Asked by Anjali Mehta · 2 years ago
I've read that the speed of light in vacuum is constant. Why is it so, and does it vary with the medium?
1 Answer
The speed of light in vacuum is constant because it is a fundamental property of the universe. According to Einstein's theory of relativity, the speed of light in a vacuum is the same for all observers, regardless of their motion or the motion of the light source. This constancy is a cornerstone of modern physics.
However, the speed of light does vary when it travels through different media. For example, light travels slower in water or glass compared to a vacuum. This change in speed is due to the interaction of light with the particles in the medium, which causes it to slow down.
NEET Faculty · 2 years ago
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