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

  • question_answer
    A parallel beam of monochromatic light of wavelength\[5000\,\,{AA}\]is incident normally on a single narrow slit of width 0.001 mm. The light is focused by a convex lens on a screen placed on the focal plane. The first minimum will be formed for the angle of diffraction equal to      [CBSE PMT 1993]

    A) \[0{}^\circ \] 

    B) \[15{}^\circ \]

    C) \[30{}^\circ \]

    D) \[60{}^\circ \]

    Correct Answer: C

    Solution :

    For the first minima \[d\sin \theta =\lambda \] \[\Rightarrow \] \[\sin \theta =\frac{\lambda }{d}\,\,\,\,\Rightarrow \]\[\theta ={{\sin }^{-1}}\left( \frac{5000\times {{10}^{-10}}}{0.001\times {{10}^{-3}}} \right)={{30}^{o}}\]


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