Light Bulb Logic Puzzle

Determine which switch turns on the light. The images below are just
for illustraion and have nothing to do with which switch controls the light.
No outside help is available. The switch plate may not be removed.

 

Here's the puzzle:

• There's a room with three switches.
  
  
• Only one of the switches turns on a light sitting on a table in a room down the hall.
  
  
• From the room with the switches there is no way know when the light goes on or off.
  
  
• You have two minutes to throw any of the switches up and down as desired.
  
  
• At the end of two minutes, you are to walk down the hall and into the room with the light bulb.
  
  
• Which light switch controls the light?