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JCECE Medical JCECE Medical Solved Paper-2012

  • question_answer
    A convex mirror of focal length \[f\] forms an image which is \[\frac{1}{n}\] times the object. The distance of the object from the mirror is

    A) \[\left( \frac{n-1}{n} \right)f\]

    B)  \[\left( \frac{n+1}{n} \right)f\]

    C)  \[(n+1)f\]

    D)  \[(n-1)f\]

    Correct Answer: D

    Solution :

     Given magnification, \[m=\frac{1}{n}\] So, \[\frac{1}{n}=-\frac{v}{u}\] or \[v=-\frac{u}{n}\] By using mirror formula,\[\frac{1}{f}=\frac{1}{v}+\frac{1}{u}\] \[=\frac{1}{-u/n}+\frac{1}{u}\] \[\Rightarrow \] \[u=-(n-1)f\]


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