Standing somewhere between two vertical mirrors, you hold a lantern and at (t=0) emit a light pulse

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Standing somewhere between two vertical mirrors, you hold a lantern and at \(t=0\) emit a light pulse that travels in all directions. You observe the pulse reflected from the mirror on your right at \(t=2.5 \mu \mathrm{s}\) and from the mirror on your left at \(t=6.5 \mu \mathrm{s}\). What is the distance between the two mirrors in your reference frame?

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