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## Main Question or Discussion Point

Suppose we have two frames (frame 1 and frame 2) which are passing each other infinitesimally close at a relative velocity v with respect to x axes in both frames..

We have two points, a and b, in frame 1 with separation L along the x axis.

We have two other points, c and d also in frame 1 where point c is infinitesimally above (y axis) point a and point d is infinitesimally above point b (so c and d are also with separation L along the x axis).

We fire lasers simultaneously from a, b, c, and d (all in frame 1) orthogonally to vector v towards frame 2 .

In frame two, there is a fully reflective surface opposite to point a and b

and a laser detecting sensitive surface opposite to c and d.

Let g and h be the points where the laser beams (which were fired from c and d) strike and are detected in frame 2.

Let e and f be the points in frame 1 where the laser beams (which were fired from a and b) strike in frame 1 after being reflected from frame 2.

Questions:

What is the separation in frame 1 of e and f in terms of L?

What is the separation in frame 2 of points g and h in terms of L (with respect to a coordinate system in frame 2 that is congruent to that of frame 1 when the two frames are at rest)?

We have two points, a and b, in frame 1 with separation L along the x axis.

We have two other points, c and d also in frame 1 where point c is infinitesimally above (y axis) point a and point d is infinitesimally above point b (so c and d are also with separation L along the x axis).

We fire lasers simultaneously from a, b, c, and d (all in frame 1) orthogonally to vector v towards frame 2 .

In frame two, there is a fully reflective surface opposite to point a and b

and a laser detecting sensitive surface opposite to c and d.

Let g and h be the points where the laser beams (which were fired from c and d) strike and are detected in frame 2.

Let e and f be the points in frame 1 where the laser beams (which were fired from a and b) strike in frame 1 after being reflected from frame 2.

Questions:

What is the separation in frame 1 of e and f in terms of L?

What is the separation in frame 2 of points g and h in terms of L (with respect to a coordinate system in frame 2 that is congruent to that of frame 1 when the two frames are at rest)?