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Postulates of Special Theory of Relativity

The negative result of Michelson-Morley experiment gave rise to postulates of Special Theory of Relativity by Einstein. Which are given below :

 

First Postulate: The fundamental laws of physics have the same form for all inertial frames. No preferred inertial system exists. This is the principle of relativity.

 

Second Postulate: The speed of light in free space has the same value in all inertial

frames of reference. This is the principle of constancy of the speed of light.