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State the two pillars or fundamental postulates on which the Theory of Relativity is      built.

State the two pillars or fundamental postulates on which the Theory of Relativity is

     built.

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Answer #1

1st postulate: All the laws of physics have the same form in all inertial system, moving with constant velocity relative to one another. This postulate is just the principle of relativity.

2nd postulate: The speed of light is constant in vacuum in every inertial system. This postulate is an experimental fact and asserts that the speed of light does not depend on the direction of propagation in vacuum and the relative velocity of the source and the observer. In fact, the second postulate is contained in the first because it predicts the speed of light C to be constant of nature.

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