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JCECE Medical JCECE Medical Solved Paper-2010

  • question_answer
    A microscope is focussed on a3 mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive index 1.5 is placed over a mark. How should the microscope be moved to get the mark again in focus?

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


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