(adsbygoogle = window.adsbygoogle || []).push({}); "Absolute" light speed or velocity or both?

Consider an inverse of Einstein's light clock. On a cartesian plane in a vacuum, a beam of light emanates from the origin at 45 degrees with velocity c. Is it OK that the x and y component velocities are each less than c (i.e. c divided by sqrt 2) or must time adjust to make component velocities also c?

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Absolute light speed or velocity or both?

**Physics Forums | Science Articles, Homework Help, Discussion**