Manipal Engineering Manipal Engineering Solved Paper-2014

  • question_answer
    A point object is placed at a distance of 20 cm from a thin plano-convex lens of focal length 15 cm, if the plane surface is silvered. The image will form at

    A) 60 cm left of AB

    B)  30 cm left of AB

    C) 12 cm left of AB               

    D)  60 cm right of AB

    Correct Answer: C

    Solution :

    \[C{{H}_{3}}OC{{H}_{2}}C{{H}_{3}}l\] \[C{{H}_{3}}COC{{H}_{3}}+N{{H}_{3}}+{{H}_{2}}\xrightarrow[{}]{Ni}\] \[C{{H}_{3}}C{{H}_{2}}CN+{{H}_{2}}\xrightarrow[{{140}^{o}}C]{Ni}\]v = - 12 cm i.e. 12 cm left of AB.


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