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**Observer in S1 thinks like this. For one second in his clock the clock in S2 will run [tex]\sqrt{1-v^{2}/c^{2}}[/tex] seconds. In this time the relative separation between the observer in S2 and photon decreases by (c+v)[tex]\sqrt{1-v^{2}/c^{2}}[/tex] considering length contraction.**

So from S1 point of view using relativity theory the velocity of photon measured by S2 will be

**distance/ time = c+v**. But it has to be c which we get from velocity addition rule also.

What is wrong here?