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This tag is for questions regarding the 'time dilation' which is the lengthening of the time interval between two events for an observer in an inertial frame that is moving with respect to the rest frame of the events (in which the events occur at the same location).
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I cannot understand $\tau_{see}$ means in the question
τ_see is the time Q records between the clock reaching A and the clock reaching B.
Since photons take time to travel, the clock is already far past A by the time Q sees it. B is closer to Q so the pho …