JEE Main & Advanced Sample Paper JEE Main Sample Paper-16

  • question_answer
    The minimum thickness of film which will strongly reflect the normally incident light of  \[\lambda =600\,nm,\], the R.I of material of film is 1.25

    A)  120 nm               

    B)  100 nm

    C)  110 nm               

    D)  90 nm

    Correct Answer: A

    Solution :

    \[2\mu t=\frac{\lambda }{2}\]    \[t=\frac{6\times {{10}^{-7}}}{4\times 1.25}\]


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