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Dear All,

In the http://galileoandeinstein.physics.virginia.edu/lectures/srelwhat.html" [Broken], there is one assumption I don't understand.

Why do we assume that the distance

What am I missing?

In the http://galileoandeinstein.physics.virginia.edu/lectures/srelwhat.html" [Broken], there is one assumption I don't understand.

Why do we assume that the distance

*w*between the mirrors is constant for both the observer in the train and the observer outside the train? We could also let this distance shrink for the observer outside the train as soon as the train starts moving, and keep the time between two reflections constant.What am I missing?

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