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NEET Sample Paper NEET Sample Test Paper-78

  • question_answer
    Monochromatic light of wavelength 4500 A falls on slit width a. In diffraction pattern secondary maxima deviates through\[30{}^\circ \]. The slit width is

    A)  1800 A                        

    B)  13500 A              

    C)  22500 A                      

    D)  None of these

    Correct Answer: B

    Solution :

    According to question \[a\,\sin \,\theta =3\,\left( \frac{\lambda }{2} \right)\,\,\,\,\,\,\,\,\,\,\,\,\,\,(first\,\,secondary\,\,maxima)\] \[a\,\sin \,\,30{}^\circ =\,\,\frac{3\times 4500}{2}\] \[\operatorname{a}\,\,=\,\,13500\,\overset{{}^\circ }{\mathop{A}}\,\]


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