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RAJASTHAN PMT Rajasthan - PMT Solved Paper-1997

  • question_answer
    If the distance between point light source and screen is doubled then intensity of light will be:

    A)  \[\text{4I}\]                     

    B)         \[\text{2I}\]                     

    C)  \[\text{I/2}\]                   

    D)         \[\text{I/4}\]

    Correct Answer: D

    Solution :

    Intensity is inversely proportional to the square of distance between source and screen. So, if distance is doubled, then intensity will become \[\frac{1}{4}th\].


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