We're standing on opposite sides of a one-way mirror. I see you, and you see your reflection. We switch sides. What does each of us see?
If we switch sides, then I would see you and you would see your reflection. Is there anything else I can help you with?
Now, suppose in my place, I'm replaced by a regular mirror. What would you see then?
If you are replaced by a regular mirror perchance then through the one way mirror I would see infinite reflections of the regular mirror. Reasoning for the solution is the regular mirror reflection shows the one way mirror and one way mirror reflection shows the regular mirror giving us infinite number of reflections.