I've been showing a special interest in Einstein's theory of relativity and how he proved the speed of light to be always the same. At first it was a bit hard for me to understand, but now I THINK I understand what this means.
So basically Einstein's theory claims that the speed of light is always the same, even if supposedly someone (say, person A) would move towards a light beam, he would measure the same speed in respect to a person (say, person B) measuring the speed of the light beam from a relative rigid position. Furthermore, the theory states that the time for person A is moving slower in respect to person B, because person A is moving in respect to person B (the time of a moving object runs slower in respects to a rigid object).
Keeping these features in mind, I've stated an example to try and explain why person A and B are measuring the same speed of light, even though person B is moving towards the light (you would think he'd measure a greater speed), which is as follows:
We have person A, whose moving with v=100,000 km/s straight towards a light beam with c=300,000 km/s. Then there's person B, who is standing at a rigid position in respect to the earth, so we can state that person B's velocity is 0 km/h. A "logical" measurement of the speed of the light beam for person A would be 100,000 + 300,000 = 400,000 km/s and 300,000 + 0 = 300,000 km/s for person B. This, however, is not what we observe. We observe the measurements of the speed of light of the two persons to be exactly the same (c = about 300,000 km/s). So I personally thought that the measurements of the speed of the light beams are exactly the same because time is slowing down for person A in respect to person B. So, person A WOULD measure 400,000 km/s, were it not that 1 second for him is not the same second for person B. A simple calculation would then conclude that in 1 second of person B's time 0.75 seconds passes in person A's time (400,000 times 0.75 equals 300,000 km/s equals the speed of light).
Can somebody tell me if my way of thinking is legit? Thanks in advance.