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JEE Main & Advanced Physics Ray Optics Question Bank Photometry

  • question_answer
    When sunlight falls normally on earth, a luminous flux of \[1.57\times {{10}^{5}}\ lumen/{{m}^{2}}\] is produced on earth. The distance of earth from sun is \[1.5\times {{10}^{8}}Km\]. The luminous intensity of sun in candela will be 

    A)            \[3.53\times {{10}^{27}}\]      

    B)            \[3.53\times {{10}^{25}}\]

    C)            \[3.53\times {{10}^{29}}\]      

    D)            \[3.53\times {{10}^{21}}\]

    Correct Answer: A

    Solution :

               \[I=\frac{L}{{{r}^{2}}}\]\[\Rightarrow L=1.57\times {{10}^{5}}\times {{(1.5\times {{10}^{11}})}^{2}}\]\[=3.53\times {{10}^{27}}\]Cd


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