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Manipal Engineering Manipal Engineering Solved Paper-2013

  • question_answer
    An object is placed at a distance 20 cm from the pole of a convex mirror of focal length 20 cm. The image is produced

    A)  13.3 cm

    B)                         20 cm  

    C)  25 cm  

    D)         10 cm

    Correct Answer: D

    Solution :

    \[u=-20\,\,cm,\,\,f=20\,\,cm\] From mirror formula                 \[\frac{1}{f}=\frac{1}{v}+\frac{1}{u}\]                 \[\frac{1}{20}=\frac{1}{v}+\frac{1}{-20}\]                   \[\frac{1}{v}=\frac{1}{20}+\frac{1}{20}\]                   \[\frac{1}{v}=\frac{2}{20}=v=10\,\,cm\]


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