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CMC Medical CMC-Medical Ludhiana Solved Paper-2007

  • question_answer
    A slit of width \[12\times {{10}^{-7}}m\] is illuminated by light of wavelength 6000\[{{A}^{o}}\]. The angular width of the central maximum is approximately

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

    B)  \[60{}^\circ \]

    C)  \[90{}^\circ \]                                  

    D)  \[0{}^\circ \]

    Correct Answer: B

    Solution :

                    Angular width of central maximum\[=2\theta \] Now,     \[\sin \theta =\frac{\lambda }{a}\]                 \[\sin \theta =\frac{6000\times {{10}^{-10}}}{12\times {{10}^{-7}}}\]                 \[\sin \theta =0.5\]                       \[\theta =30{}^\circ \] Hence,      \[2\theta =60{}^\circ \]


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