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RAJASTHAN PMT Rajasthan - PMT Solved Paper-1999

  • question_answer
    Intensity of a source of a 100 candela at a distance 2 metre is:

    A)  25 Lux                 

    B)         50 Lux

    C)  75 Lux                 

    D)         150 Lux

    Correct Answer: A

    Solution :

    Intensity \[E=\frac{I}{{{r}^{2}}}\]  \[=\frac{100}{{{(2)}^{2}}}=\frac{100}{4}=25\,\text{lux}\]


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