Mirror on the Wall: Light Reflection Mystery

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Two planes of mirrors facing each other would reflect images of each other indefinitely, creating a series of diminishing reflections. If positioned at a distance apart, the mirrors would reflect photons bouncing back and forth, leading to a continuous cycle of light. The reflections would become smaller until they exceed the resolution of the mirrors. The presence of an observer or light source would further influence the reflections and the overall dynamics of the light. Ultimately, the interaction between the mirrors and light creates a complex visual phenomenon.
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If two planes of mirrors (infinite in all directions) were facing each other with nothing in between what would they reflect? How does light come into play in this?
If they were not directly stuck to each other (in which case there would be absolute black, no light I assume) but at a distance apart?
 
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Just my thoughts, not an expert answer.
I suspect that they would each reflect a slightly smaller version of the opponent... indefinitely. The end point, I believe, would be when the resolution of the image exceeds the resolution of the mirror.
 
The only sensible answer I've got is "any photons already there would bounce back and forth between the mirrors". There would be more to say if an observer and light source were included.
 

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