Who Told Vorderman People Care What She...
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No best answer has yet been selected by boink. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.If someone invented a 100% perfect reflector (imposible, I imagine), then it should be possible to have a small opening through which to shine some light at an angle so that it doesnt reflect straight out, and then quickly close the opening ...
The light would then bounce around forever, but the box would not really remain 'lit'. If we say 'lit', then we are imagining being able to 'see' the glow emanating from the box. Any opening through which to see, would let the light out pretty quickly.
If the opening in the box was opened sometime later then I suppose a brief flash could be detected as the photons emerged...