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J & K CET Engineering J and K - CET Engineering Solved Paper-2013

  • question_answer
    If two slits in Young's experiment are \[0.4\text{ }mm\]apart and fringe width on a screen \[200\text{ }cm\]away is \[2\text{ }mm\]the wavelength of light illuminating the slits is

    A)  \[500\text{ }nm\]          

    B)  \[600\text{ }nm\]

    C)  \[400\text{ }nm\]         

    D)  \[300\text{ }nm\]

    Correct Answer: C

    Solution :

    Fringe width \[W=\frac{D\lambda }{d}\] Given. \[d=0.4\,mm=0.04\,cm,\,D=200\,\,cm\] \[W=2mm=0.2\,cm\] \[\therefore \] \[0.2=\frac{200\times \lambda }{0.04}\] \[\Rightarrow \]\[\lambda =400nm\]


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