There are two rooms: Room A and Room B; initially both are dark; contains no light source (of whatsoever). Now, I bought a light source and set it up in the room A, enabling me to see things inside the room A; photons from the light source bounced back from the walls and things contained within the room to my eyes, enabling me to see inside the Room A. Ok.

Now, consider a pretty hypothetical situation, the moment photons bounced back and head towards my eyes; "at the same instant", I somehow (SOMEHOW) transferred those photons into the Room B "at the same instant", the Room B had no light source initially.

Now, here comes my question: While observing Room B, what would I see? Will I see Room B (as I should) or Will I see Room A in Room B (because there are photons from a different source)

My explanation for the question is like this:

I'll see room A in room B, for some time (don't know for how long?), and as soon as photon spread across the room B, I'll start to see room B. However, Isn't this process should be instantaneous? Considering photon travels at the speed of light, so I should NOT be able to see Room A at all. I should see room B, however, I don't know.

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