Are you clever enough to solve this?

 

There are two rooms side by side in a corridor. Room A and Room B.

You are in Room A. You cannot see Room B or what is in it.

Room A has three electric switches on a table - switch 1, switch 2 and switch 3.

Each switch connects to a light bulb in Room B. But you do not know which switch connects to which light bulb.

Your mission, should you choose to accept it, is to identify which switch connects to which light bulb.

You are only allowed to visit Room B ONCE only. That is the time when you identify which light bulb connects to its correct switch.

Once you leave Room A you cannot go back there - you have to go to Room B to identify the light bulbs.

How do you do it?

Tell us your answer in the comments box below.

P.S. I'll post the answer in the comments box shortly. Good luck!