SPECIAL THEORY OF RELATIVITY (TEORI RELATIVITAS KHUSUS)
Special theory of relativity proposed by Albert Einstein after Michelson and Morley experiment can prove that the hypothesis about the medium of ether did not exist at all.
The theory of special relativity is based on two postulates, namely:
• Postulate I
The laws of physics apply to a coordinate frame S, applies also for the other coordinate frame (S ‘), which moves with constant velocity relatf against S.
• Postulate II
Fast value of Light in a vacuum is an absolute / same, not depending on the motion of the observer and light sources.