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NEET Sample Paper NEET Sample Test Paper-41

  • question_answer
    W. A beam of light of wavelength 600nm from a distant source falls on a single slit 1mm wide and the resulting diffraction pattern is observed on a screen 2m 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 :

    distance between the first dark fringes on either side of the centred bright fringe,   \[\operatorname{x}=\frac{2\lambda D}{d}\] \[\operatorname{x}=\frac{2\times 600\times 1{{0}^{-9}}\times 2}{1{{0}^{-3}}}=24\times 1{{0}^{-4}}m\] \[\operatorname{x}=2.4mm\left( \therefore 1m=1{{0}^{3}}mm \right)\]


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