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RAJASTHAN PMT Rajasthan - PMT Solved Paper-2011

  • question_answer
    If in Fraunhofer diffraction due to a single slit, the slit width is increased, then the width .of the central maximum will

    A)  increase

    B)  decrease

    C)  not change

    D)  change depending upon the wavelength of light used

    Correct Answer: B

    Solution :

    Fringe width                 \[w=\frac{2f\lambda }{a}\] So,          \[w\propto \frac{1}{a}\] It means \[a\] increases then w decreases.


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