825.2 the need for change and the postulates of the special theory Experiment is performed in reference frame S: C Experiment is performed in reference frame s which is moving at speed v in the same direction as light is moving 825.2 the need for change and the postulates of the special theory Therefore the galilean transformation equations between two inertial reference frames need to be modified to accommodate the observed invariance of the speed of light. The new transformation equations, called the lorentz transformation equations together with their implications and consequences, constitute the special theory of relativity 2. The postulates of special theory of relativity @the speed of light in a vacuum has the same numerical value c in any inertial reference frame, independent of the motion of the source and observer 1010 Experiment is performed in reference frame S: c c Experiment is performed in reference frame S’ which is moving at speed v in the same direction as light is moving: c v r c §25.2 the need for change and the postulates of the special theory Therefore the Galilean transformation equations between two inertial reference frames need to be modified to accommodate the observed invariance of the speed of light. The new transformation equations , called the Lorentz transformation equations, together with their implications and consequences, constitute the special theory of relativity. 2. The postulates of special theory of relativity 1the speed of light in a vacuum has the same numerical value c in any inertial reference frame, independent of the motion of the source and observer. §25.2 the need for change and the postulates of the special theory