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0 votes
3 answers
90 views

Is it possible to distinguish the type of space according to the speed of light in vacuum? [duplicate]

Why is the speed of light 300 000 km/s? The speed of light is slower in glass, water and diamond. Is the speed of light in water, glass and diamond also absolute? Can we calculate the material such as ...
Darwin's user avatar
  • 101
-2 votes
4 answers
2k views

Why is the speed of light considered as a fundamental constant if its speed changes with medium resulting in refraction? [duplicate]

I know that the speed of light, the universal constant of gravitation and the Planck's constant are considered to be the three fundamental constants of the universe. But, why is speed of light ...
Rajath Radhakrishnan's user avatar
2 votes
2 answers
2k views

What do physicists mean when they say "speed of light"?

Does it make sense to say, "The speed of light varies?" Some may say right off the bat "Yes, it changes as a wave passes through a different medium." However, I'd like to say no, because when I hear ...
MGZero's user avatar
  • 495