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JEE Main & Advanced Physics Ray Optics Question Bank Photometry

  • question_answer
    If the luminous intensity of a 100 W unidirectional bulb is 100 candela, then total luminous flux emitted from the bulb is                                                                                              [AIIMS 1998]

    A)            861 lumen                             

    B)            986 lumen

    C)            1256 lumen                           

    D)            1561 lumen

    Correct Answer: C

    Solution :

               \[\varphi =4\pi L\]\[=4\times 3.14\times 100\]= 1256 lumen.


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