Fig. 2.
Download original image
Left: emitting matter in the lab frame K, moving with velocity 
along the vertical axis in a tube of width d. A photon of frequency ν crosses the tube, traveling at an angle θ from the vertical axis. Right: emitting matter in its rest frame K′ in the tube. The photon with frequency ν ′ now appears to cross the tube at angle θ ′.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.