This was something i wan thinking about yesterday.
Imagine a room, where no light can enter or espape. It. There is NO light whatsoever. You can't see a thing. You are inside the room (just imagine this).
Now, u have a flashlight. When u start it, you will see a beam on the walls of the room. Shouldn't the room evenutally start to get brighter overtime? Since the light is only reflected off in all directions, no light is lost. Or is there something I am missing?