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VIT Engineering VIT Engineering Solved Paper-2008

  • question_answer
    A slit of width a is illuminated with a monochromatic light of wavelength \[\lambda \] from a distant source and the diffraction pattern is observed on a screen placed at a distance D from the slit. To increase the width of the central maximum one should

    A)  decrease D

    B)  decrease \[\alpha \]

    C)  decrease \[\lambda \]

    D)  The width cannot be changed  

    Correct Answer: B

    Solution :

    Width of the central maximum, \[{{\beta }_{0}}=\frac{2D\lambda }{a}\] \[{{\beta }_{0}}\alpha \frac{1}{a}\] \[\therefore \] To increase the width of the central maximum one should decrease a.


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