9.2 Time in Motion

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Can you explain again why the ball of light doesn’t miss the top mirror when the clock is moving?

Wait: If the ball of light is bouncing up and down—and not coming to our eyes—how do we actually see it?

Since the clock we’ve called “moving” can claim that it is stationary and everything else is moving, can’t we argue that from the standpoint of the “moving” clock, it is the “stationary” clock that ticks slowly?

Is the slowing of the tick-tocks you found just a strange property of a strange clock — the light clock? In what sense is the light clock really a clock, anyway?

How do you really know that the slowing of time we found on a light clock implies that there would be a slowing of time on any clock?