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JEE Main & Advanced Physics Wave Optics / तरंग प्रकाशिकी Question Bank Diffraction of Light

  • question_answer
    A beam of light of wavelength 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 the first dark fringes on either side of the central bright fringe is   [IIT-JEE 1994; KCET 2004]

    A)            1.2 mm                                   

    B)            1.2 cm

    C)            2.4 cm                                     

    D)            2.4 mm

    Correct Answer: D

    Solution :

               Distance between the first dark fringes on either side of central maxima = width of central maxima    = \[\frac{2\lambda D}{d}\]= \[\frac{2\times 600\times {{10}^{-9}}\times 2}{1\times {{10}^{-3}}}\] = 2.4 mm.


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