Assuming there was a light source bright enough to illuminate the room, it would look like an extremely distorted smear of yourself and the light source, possibly inverted depending on the size of the room.
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1 up, 2y,
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we can suppose your clothing to be dotted with many tiny light sources. i think it would have to look somewhat like an inside-out image of you, as if someone painted your image on a body-shaped balloon and then turned it inside out. but the head and limbs are hard for me to imagine.
The image would depend largely on how far you were from the mirror surface, and therefore the diameter of the room. It would either be blurry as shit or upside down and contorted around the conture of the mirror. Might even get that cool 3d projection effect. I'm just guessing--an actual expert might laugh and call me an idiot. They may even tell me I'm wrong! 😝
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1 up, 2y,
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well we'll just have to do the experiment. mirrors can be created by running a chemical reaction (a Tollens reduction) on a glass surface. colorless silver ion is easily converted to elemental silver that deposits on the glass. so we can create our spherical mirror by running this reaction inside a hollow glass sphere (like a thin-necked round-bottom flask). then we insert a tiny light-source and camera on a wire and take a look.