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NEET Sample Paper NEET Sample Test Paper-64

  • question_answer
    A beam of light of \[\lambda \,\,=\,\,600\,nm\] from a 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 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 :

    Given \[D\,\,=\,\,2\,\,m;\,\,d=1\,\,mm=1\times {{10}^{-}}^{3}m\] \[\lambda \,\,=\,\,600\,nm=600\times {{10}^{-\,6}}\,m\] Width of central bright fringe \[\left( =\,\,2\beta  \right)\] \[=\,\,\frac{2\lambda D}{d}\,\,=\,\,\frac{2\times 600\times {{10}^{-6}}\,\times 2}{1\times {{10}^{-\,3}}}\,m\] \[=2.4\,\,\times \,\,{{10}^{-3}}m\,\,=\,\,2.4\,mm\]


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