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JEE Main & Advanced Sample Paper JEE Main Sample Paper-9

  • question_answer
    Two coherent mono-chromatic light beams of intensities \[l\] and \[\text{4}l\] are superposed. The maximum and minimum possible intensities in the resulting beam are

    A)  \[5\text{ }l\text{ }and\text{ }l\]               

    B)  \[5\text{ }l\text{ }and\text{ 3}l\]

    C)  \[\text{9 }l\text{ }and\text{ }l\]                               

    D)  \[\text{9}l\text{ }and\text{ 3}l\]

    Correct Answer: C

    Solution :

    \[{{l}_{\max }}={{\left( \sqrt{{{l}_{1}}}+\sqrt{{{l}_{2}}} \right)}^{2}}=9l\]\[{{l}_{\min }}={{\left( \sqrt{{{l}_{1}}}-\sqrt{{{l}_{2}}} \right)}^{2}}=l\]


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