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CMC Medical CMC-Medical Ludhiana Solved Paper-2009

  • question_answer
    A beam of light of wavelength 600 nm from distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between the first dark fringes on either side of the central bright fringe is

    A)  1.2 cm                                 

    B)  1.2 mm

    C)  2.4 cm                                 

    D)  2.4 mm

    Correct Answer: D

    Solution :

                    \[\beta =\frac{\lambda D}{d}=\frac{600\times {{10}^{-9}}\times 2}{1\times {{10}^{-3}}}=12\times {{10}^{-4}}m\] So, distance between the first dark fringes on either side of the central bright fringe \[X=2\beta \] \[=2\times 12\times {{10}^{-4}}m\] \[=24\times {{10}^{-4}}m\] \[=2.4\text{ }mm\]


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