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JEE Main & Advanced Physics Wave Optics / तरंग प्रकाशिकी Question Bank Self Evaluation Test - Wave Optics

  • question_answer
    Figure shows two coherent sources \[{{S}_{1}}-{{S}_{2}}\] vibrating in same phase. AB is an irregular wire lying at a far distance from the sources \[{{S}_{1}}\] and \[{{S}_{2}}\].Let\[\frac{\lambda }{d}={{10}^{-3}}\].\[\angle BOA={{0.12}^{o}}\] . How many bright spots will be seen on the wire, including points A and B.  

    A) 2

    B) 3

    C) 4

    D) more than 4     

    Correct Answer: A

    Solution :

    [a] Angular width\[=\frac{\lambda }{d}={{10}^{-3}}\] (given) \[\therefore \] No. of fringes within \[0.12{}^\circ \] will be \[n=\frac{0.12\times 2\pi }{360\times {{10}^{-3}}}\cong \left[ 2.09 \right]\] \[\therefore \] The number of bright spots will be two


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