Three bulbs

There are three bulbs in a closed hall and all the three switches are outside.
You are to identify the corresponding switches of the bulbs.
The condition is you can enter the room only once.
But the number of operations of the switches are unlimited.
Can you find out the way ?

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24 Responses to “Three bulbs”

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  • g vinoth KNCET:

    first i will SWITCH ON the first bulb and wait for some times then switch off it. next i SWITCH ON second bulb and go to room.
    i found that the heat dissipating bulb is responsible for SWITCH 1 and if the bulb is glowing means it is for switch 2 and if it is not glow means it is for switch 3 and the remain switch is for bulb 3