Light in room riddle

You are standing in front of a room with one light bulb inside of room. You cannot see whether it is on or off. Outside the room there are three switches in the off positions. You may turn the switches any way you want to. You stop turning the switches, enter the room and know which switch controls the light bulb. How?

SherlockHolmes Expert Asked on 4th July 2019 in Hadest puzzles.
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