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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2007

  • question_answer
    Light from two coherent sources of the same amplitude A and wavelength \[\lambda \] illuminates the screen. The intensity of the central maximum is \[{{I}_{0}}\]. If the sources were incoherent, the intensity at the same point will be

    A)  \[4{{I}_{0}}\]                                    

    B)  \[2{{I}_{0}}\]

    C)  \[{{I}_{0}}\]                                      

    D)  \[\frac{{{I}_{0}}}{2}\]

    Correct Answer: D

    Solution :

    The rays of light from two coherent sources superimpose each other on the screen forming alternate maxima (with maximum intensity Io) and minima (with intensity zero). If two non-coherent sources superimpose, there will be no maxima and minima, instead the intensity will be throughout.


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