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

  • question_answer
    What will be the angle of diffracting for the first minimum due to Fraunhoffer diffraction with sources of light of wave length 550 nm and slit of width 0.55 mm                          [Pb. PMT 2001]

    A)            0.001 rad                               

    B)            0.01 rad

    C)            1 rad                                        

    D)            0.1 rad

    Correct Answer: A

    Solution :

                       Using \[d\sin \theta =n\lambda ,\]for n =1            \[\sin \theta =\frac{\lambda }{d}=\frac{550\times {{10}^{-9}}}{0.55\times {{10}^{-3}}}={{10}^{-3}}=0.001\ rad\]


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