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NEET Sample Paper NEET Sample Test Paper-65

  • question_answer
    In a compound microscope, the focal lengths of two lenses are 1.5 cm and 6.25 cm. An object U is placed at 2 cm from objective and the final image is formed at 25 cm from eye lens. The distance between the two lenses is

    A) 6.00 cm                        

    B) 7.75 cm

    C) 9.25 cm                        

    D) 11.00 cm

    Correct Answer: D

    Solution :

    \[L={{v}_{0}}+{{u}_{e}}=\frac{{{u}_{0}}{{f}_{0}}}{({{u}_{0}}-{{f}_{0}})}\,\,+\,\,\frac{{{f}_{e}}D}{{{f}_{e}}+D}\] \[\Rightarrow \,\,\,\,L=\frac{2\times 1.5}{(2-1.5)}+\frac{6.25\times 25}{(6.25+25)}\,\,=\,\,11\,\,cm\]


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