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AFMC AFMC Solved Paper-2010

  • question_answer
    The optical path of a monochromatic light is same if it goes through 4.0 cm of glass or 4.5 cm of water. If the refractive index of glass is 1.53, the refractive index of the water is

    A) 1.30                                       

    B) 1.36

    C) 1.42                                       

    D) 1.46

    Correct Answer: B

    Solution :

    As optical paths are equal, hence \[{{n}_{g}}.{{x}_{g}}={{n}_{w}}.{{x}_{w}}\] \[\Rightarrow \] \[{{n}_{w}}={{n}_{g}}.\frac{{{x}_{g}}}{{{x}_{w}}}\] \[=1.53\times \frac{4.0}{4.5}\] \[=1.36\]


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