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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2010

  • question_answer
        A microscope is focused on a mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over the mark. How should the microscope be moved to get the mark again in focus?

    A)  2 cm upward   

    B)  1 cm upward

    C)  4.5 cm downward,         

    D)  1 cm downward

    Correct Answer: B

    Solution :

                    Apparent depth \[=\frac{real\text{ }depth}{\mu }=\frac{3}{1.5}=2\,cm\] As image appears to be raised by 1 cm, therefore microscope must be moved upwards by 1 cm.


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