What does the theory of relativity states?
Well, i am taking theory of relativity as “Special theory of relativity” of Einstein. Here, we have two basic assumption: 1. velocity of light(c) is constant for all frame.(the value of c is an universal constant) 2. Laws of physics are invariant on all frame. special theory assumes the frames are inertial, i.e. there is no acceleration. On this postulates, we can show many interesting things. The most important one is: THERE EXIST NO ABSOLUTE FRAME OF REFERENCE; ALL INERTIAL FRAMES ARE EQUIVALENT(if there is no acceleration i.e. braking/jerking inside a car and you are not looking outside, you cant decide whether your car is moving or is on rest). But the consequences those are most popular is TIME DILATION (the faster you move, the slower a clock ticks for you….check for Twins paradox) and LENGTH CONTRACTION (the faster you move, the shorter you be….