Hello, my first post so bear with me! I think this question is to do with 'light' so I hope it is acceptable in an Astronomy/Space forum.
If you placed two mirrors directly in front of each other you end up with a 'tunnel' of reflections so to speak. Is the appearance of each reflection anything to do with the speed of light? ie is the image reflecting back and forth at the speed of light? If so, what happens when you remove one mirror, is the image (light) not still travelling (somewhere)?
Not sure if I am making sense but any comments are appreciated.