Question

do anyone knows about theory of relativity of Mr. Albert Einstein ?​

Answer 1

Answer:

This insight led Einstein to formulate the principle of relativity: “the speed of light is a constant in any inertial frame (constantly moving frame).” During 1905, often called Einstein's “miracle year,” he published four papers in the Annalen der Physik, each of which would alter the course of modern physics: 1.

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Answer 2

Answer:

In 1905, Albert Einstein determined that the laws of physics are the same for all non-accelerating observers, and that the speed of light in a vacuum was independent of the motion of all observers. This was the theory of special relativity.