The apparent length $L'$ of an object moving at a high speed is given by the formula:
\[L' = \frac{L}{\gamma}\]
where $L$ is the original length of the object and $\gamma$ is the Lorentz factor, defined as:
\[\gamma = \frac{1}{\sqrt{1 - \frac{v^2}{c^2}}}\]
where
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