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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2004

  • question_answer
    A beam of light of wavelength 600 nm from a 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)  2.4 cm                                 

    B)  2.4 mm

    C)  1.2 mm                               

    D)  1.2 cm

    Correct Answer: B

    Solution :

    The distance between the first dark (minima) fringes on either side of the central   maximum is twice the fringe width of either maximum or minimum. \[i.e.,\] \[\beta =2\frac{D\,\lambda }{d}\]                 \[=\frac{2\times 2\times 600\times {{10}^{-9}}}{1\times {{10}^{-3}}}\]                 \[=2.4\times {{10}^{-3}}m\]                 \[=2.4\,mm\]


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