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BCECE Engineering BCECE Engineering Solved Paper-2009

  • question_answer
    An object is placed at the focus of a convex mirror. If its focal length is 20 cm, the distance of mirror is

    A)  20 cm                                  

    B)  10 cm

    C)  40 cm                  

    D)         None of these

    Correct Answer: B

    Solution :

    \[f\]is \[+\,ve\]for convex mirror. Therefore, for convex mirror                 \[\frac{1}{v}-\frac{1}{20}=+\frac{1}{20}\] \[\frac{1}{v}=\frac{1}{10}\]                 or            \[v=10\,cm\]


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