If you move at 5 ms−1 towards a plane mirror, your reflection moves 10 ms−1 towards you.
But what happens if you're moving much faster, say 0.8c?
Would your reflection move at 1.6c, since it's not a physical object? Or is it still confined to the speed of light and you have to apply the Lorentz factor? Or, does some strange light-reflecting thing occur since you're moving so fast at a mirror?
Answer
The mirror is equivalent physically to a legitimate person mimmicking you behind an open gap... so apply the same logic as two trains coming towards each other at relativistic speeds.
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