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Haryana PMT Haryana PMT Solved Paper-2000

  • question_answer
    A isotropic point source of 100 candela is fastened to the ceiling of the room. Then the total luminous flux falling in the whole room is :

    A)  1256 lumen                       

    B)  628 lumen

    C)  314 lumen                         

    D)  none of these

    Correct Answer: A

    Solution :

                    Total luminous flux is given by        \[F=4\pi l=4\times 3.14\times 100\] \[=1256lumen\]    


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