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Illustration Moving and Non-Moving Light Clock: Different Light Paths

Moving and Non-Moving Light Clock: Different Light Paths
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A light clock consists of two opposing mirrors between which a photon is reflected back and forth. Depending on whether the light clock is at rest (\( v = 0 \)) or moving at the velocity \( v \), the photon must travel a different distance. In case of a stationary light clock it covers the distance \( L \) and in case of a moving light clock the distance \(L'\). Since the photon always travels at the speed of light \(c\), the photon takes different amounts of time to travel the distance \(L\) or \(L'\).