I am just thinking why can't we save the light (not a bulb). Lights normally get reflect by mirror, when source is off reflection is gone or absorbed or discharged by other object in room.
Can't we save light, if we create the the closed square box using reflection mirrors with tiny hole. I am thinking to use the tiny hole as light source. If we turn on and off the source mirrors start reflecting the light infinity right?
If no, can someone tell me why can't!
If yes, I can't think where it will applicable, because we can't live in mirror box! Just that question hits my mind :P