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RAJASTHAN PMT Rajasthan - PMT Solved Paper-1995

  • question_answer
    Refractive index of air is 1.003. The correct thickness of air column which will have one or more wavelength of yellow light \[(6000\overset{\text{o}}{\mathop{\text{A}}}\,)\] than in the same thickness in vacuum is:

    A)  \[2mm\]            

    B)         \[2cm\]

    C)         2m                                        

    D)         \[2km\]

    Correct Answer: A

    Solution :

                                    For vacuum \[t=n\lambda ,\] For air \[t=(n+1)\lambda \] \[\therefore \]  \[t=\frac{\lambda }{n-1}=\frac{6\times {{10}^{-7}}}{0.0003}=2mm\]


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