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Haryana PMT Haryana PMT Solved Paper-2008

  • question_answer
    A microscope is focussed 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 in focus again?

    A)  1 cm upward                    

    B)  4.5 cm downward

    C)  1 cm downward              

    D)  2 cm upward

    Correct Answer: A

    Solution :

                    Apparent depth of mark as seen through a glass slab of thickness x and refractive index \[\mu \], is Apparent depth \[=\frac{Real\text{ }depth}{Refractive\text{ }index}\] or        \[x=\frac{x}{\mu }=\frac{3}{1.5}=2cm\] As image appears to be raised by 1 cm, therefore, microscope must be moved upward by 1 cm-. -


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