Question

What is special theory of relativity?

Answer 1

Hello!

In physics, special relativity is the generally

• Accepted
• Experimentally
• Well-confirmed physical theory 

regarding the relationship between space and time.

A calculation shows that an object of length $\sf l$ moving with velocity $\sf v$ with respect to the ether should be contracted to length $\sf l'$ given by :-

$\sf l'$ = $\sf l\: \sqrt{\sf 1 - \dfrac{ v^{2}}{c^{2}}}$

Cheers!