# Illustration Light Rectangle in a Minkowski Diagram

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In this Minkowski diagram, from the $$c\,t_{\text R}$$ system, two light pulses were sent to two other systems LR and RR. These two systems are at the same distance from each other and moving at the same speed in the same direction. Once the light pulses arrive at the two systems LL and RR, they are reflected back to the $$c\,t_{\text R}$$ system.

The two reflected light pulses arrive simultaneously and form a light rectangle.