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J & K CET Engineering J and K - CET Engineering Solved Paper-2012

  • question_answer
    In a Young's double-slits experimental arrangement, the light used has wavelength \[5000\text{ }\overset{\text{o}}{\mathop{\text{A}}}\,,\] the slit separation is \[2\text{ }mm\]and slits to screen distance is\[1\text{ }m\]. What is the width of the fringes produced on the screen?

    A)  \[0.25\text{ }mm\]       

    B)  \[0.1\text{ }mm\]

    C)  \[0.5\text{ }mm\]         

    D)  \[0.025\text{ }mm\]

    Correct Answer: A

    Solution :

    Fringe width \[\beta =\frac{\lambda D}{d}\] \[=\frac{(5000\times {{10}^{-10}})\times 1}{2\times {{10}^{-3}}}\] \[=2500\times {{10}^{-7}}m\] \[=0.25\,mm\]


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