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# Illustration Light Clock: Light Paths in Right Triangle

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In a moving light clock, the photon travels a different distance $$L'$$ than in a stationary light clock: $$L$$. Moving light clock moves to the right with velocity $$v$$. The photon always has the speed of light $$c$$ and covers the distance $$L'$$ within the time $$\Delta t'$$ and the distance $$L$$ within the time $$\Delta t$$.