JEE Main & Advanced Physics Ray Optics Question Bank Microscope and Telescope

  • question_answer
    When the length of a microscope tube increases, its magnifying power                                                 [MNR 1986]

    A)            Decreases                             

    B)            Increases  

    C)            Does not change                

    D)            May decrease or increase 

    Correct Answer: A

    Solution :

                       For a microscope \[|m|\ =\frac{{{v}_{o}}}{{{u}_{o}}}\times \frac{D}{{{u}_{e}}}\] and \[L={{v}_{o}}+{{u}_{e}}\]            For a given microscope, with increase in L, ue will increase and hence magnifying power (m) will decrease.


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