First: thanks for reading(adsbygoogle = window.adsbygoogle || []).push({});

Second: i'm not interested in other "experiments" that prove contraction of lengths (i know them and i know it works)

Third: Please find where is the problem in my simple thought

Let be a "rest frame" S with an object to measure its length and do it with a ray of light/body that move from A to the and B and come back to A

It needs a time T so that its length is d=c*T/2 (d=V*T/2 in case i use other body different to light )

Observe the same experiment in a frame S' that has a v' relative velocity in the same direction of the length of the object AB

Because of that the event doesn't happen in my frame i argue i can observe it in time T'=γT so turns to me that the object appears long d'=c*T'/2

The length is greater than the one in the rest frame. There must be an obvious mistake...

Where my thought fails and why?

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Simple special relativity mistake - find i can't

**Physics Forums | Science Articles, Homework Help, Discussion**