Comment on Show your pride

• RustySharp@programming.dev ⁨1⁩ ⁨day⁩ ago

  … when charged particles move faster than the speed of light

  So that got me curious, and found this

  nothing travels faster than light in vacuum, but light can be slowed down and something can travel faster than this “slower” light

  Somehow I’ve gone through decades of life without knowing this…

  source

  • Ephera@lemmy.ml ⁨1⁩ ⁨day⁩ ago

    What also surprised me is that the speed difference depending on medium is actually quite substantial. For example, glass has a refractive index of about 1.5.

    So, the speed of light in glass is c/1.5 ≈ 200.000 km/s, i.e. 66% of the speed of light in vacuum.

    source