This name need not be explained. Albert Einstein is considered to be one of the best physicists in the human history.
The twentieth century has undoubtedly been the most significant for the advance of science, in general, and Physics, in particular. And Einstein is the most luminated star of the 20th century. He literally created cm upheaval by the publication, in quick succession, in the year 1905, two epoch-making papers, on the concept of the photon and on the Electrodynamics of moving bodies respectively, with yet another on the Mathematical analysis of Brownian Motion thrown in, in between.
The Electrodynamics of moving bodies was the biggest sensation and it demolished at one stroke some of the most cherished and supposedly infallible laws and concepts and gave the breathtaking new idea of the relativity of space and time.
Truly it may be said that just as the enunciation of Newton’s laws of motion heralded emancipation from the age-old Aristotelian ideas of motion, so also did Einstein’s Theory of relativity make a proclamation, loud and clear, of emancipation from the crippling bondage to luminiferous ether and the confused notions of absolute space and time.
Einstein’s Introduction to His Concept of Relativity
As to an Introduction to the Theory of Relativity – one must read this statement what Einstein self-made to introduce the world:-
I am anxious to draw attention to the fact that this theory is not speculative in origin; it owes its intention entirely to the desire to make physical theory fit observed fact as well as possible. We have here no revolutionary act but the natural continuation of a line that can be traced through centuries. The abandonment of a certain concept combed with space-time and motion hitherto treated as fundamental must not be regarded as arbitrary but only conditioned by observed facts. The law of constant velocity of light in empty space which has been confirmed by the development of the electrodynamics and optics and the equal legitimacy of all inertial systems (special theory of relativity) which was proved in a particularly incisive manner by Michelson’s famous experiment, between them made it necessary, to begin with, that the concept of time should be made relative, each inertial system being given its my special time. . . . . . . . It is , to work out the relations between general concepts and empirical facts more precisely. The fundamental principle here is that the justification for a physical concept lies exclusively in its clear and unambiguous relation to facts that can be experienced.