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NEET Physics Ray Optics NEET PYQ-Ray Optics

  • 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?            [AIPMT (S) 2006]

    A) 1 cm upward

    B)                   4.5 cm downward

    C) 1 cm downward

    D)      2 cm upward

    Correct Answer: D

    Solution :

    Apparent depth of mark as seen through a glass slab of thickness x and refractive index  is
                Apparent depth
                or        
    As image appears to be raised by 1 cm, therefore, microscope must be moved upward by 1 cm.


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