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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-8

  • question_answer
    A simple microscope consists of a concave lens of power \[-10\] D and a convex lens of power +20 D in contact. If the image formed at infinity, then calculate the magnifying power. (D = 25 cm)

    A)  2.5      

    B)  3.5

    C)  2.2                  

    D)  3.0

    Correct Answer: A

    Solution :

    Power of combination, \[P={{P}_{1}}+{{P}_{2}}\] \[P=+200-10=+10D\] \[F=\frac{1}{P}+\frac{1}{10}m=\frac{100}{10}\,\,cm=10\,\,cm\] For final image at infinity \[M=\frac{D}{F}=\frac{25}{10}=2.5\]  


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