anonymous
  • anonymous
Why does light travel faster in a vacuum?
Physics
schrodinger
  • schrodinger
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sohailiftikhar
  • sohailiftikhar
because their pressure is low.
Abhisar
  • Abhisar
Because, vacuum is optically least dense. understand it like this, your speed of propagation will be less in a path full of traffic (optically dense) and will be high when traffic is low (optically rarer).
Michele_Laino
  • Michele_Laino
in a medium with refractive index n>1, the light speed is: \[\Large v = \frac{c}{n}\] and c is the light speed in vacuum. Now being n>1, we see that: \[\Large v = \frac{c}{n} < c\]

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