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Three switches outside of a room

Puzzle 1:

There is a room and  three switches outside of a room.

A tube light is hanging in a wall of a room

Only one switch is connected with the light.

In the Initial situation all the switches are turned off



If it is allowed to check in the room only once to see if the tube light is lit or not (this is not visible from the outside), how can you determine with which of the three switches the light can be switched on?