I have a simple question in foundation SR that I hope someone can clarify.
Given a mirror of length l travelling at a relativistic speed wrt a 'stationary' frame of reference containing two laser lights spaced l apart as well. If the mirror were not moving at all, the laser lights can be fired simultaneously such that each signal hits the edge of the mirror precisely.
Suppose that this mirror is travelling relativistically now. In our 'stationery' frame of reference, it undergoes length contraction. Therefore we can time the firing of our two laser lights such that the beams contain this mirror completely between them, since the mirror is now shorter.
But from the frame of the travelling mirror, it views the space between the two laser sources as contracted as well, so as it passes them, any firing of the lasers attempting to 'enclose' the mirror will result in either beam striking the mirror, since the spacing between the sources is < l .
How do we resolve this?