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• n  (physics) an imaginary surface joining all points in space that are reached at the same instant by a wave propagating through a medium

• So when a "wavefront" of light passes at an angle from dense cold air into less dense warm air, the part that reaches the warm air first races ahead of the remainder.

• wave front

News & Articles

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• EnV Productions Signs Deal With AXS TV To Broadcast WAVEFRONT Live
  LOS ANGELES, June 12, 2013 /PRNewswire/ -- EnV Productions today announced that they have signed an agreement with AXS TV, the network joint venture among Mark Cuban Companies, Ryan Seacrest Media, and partners AEG and talent agency Creative Artists Agency (CAA) to air the WAVEFRONT...
  June 12, 2013 - PR Newswire