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J & K CET Engineering J and K - CET Engineering Solved Paper-2007

  • question_answer
    On introducing a thin film in the path of one of the two interfering beams, the central fringe will shift by one fringe width. If \[\mu =1.5,\] the thickness of the film is (wavelength of monochromatic light is \[\lambda \])

    A)  \[4\,\lambda \]           

    B)  \[3\,\lambda \]

    C)  \[2\,\lambda \]           

    D)  \[\lambda \]

    Correct Answer: C

    Solution :

    \[\beta =\frac{\beta }{\lambda }(\mu -1)t\] \[\Rightarrow \] \[t=\frac{\lambda }{(\mu -1)}=\frac{\lambda }{(1.5-1)}=2\lambda \]


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