JEE Main & Advanced Physics Ray Optics Question Bank Spherical Mirror

  • question_answer Image formed by a concave mirror of focal length 6 cm, is 3 times of the object, then the distance of object from mirror is                     [RPMT 2000]

    A) - 4 cm                                     

    B) 8 cm

    C) 6 cm                                         

    D) 12 cm

    Correct Answer: A

    Solution :

    m = ± 3 and f = ? 6 cm Now \[m=\frac{f}{f-u}\,\,\,\Rightarrow \,\,\pm 3=\frac{-\,6}{-6-u}\] For real image \[-\,3=\frac{-\,6}{-6-u}\]  Þ \[u=-\,8\,cm\] For virtual image \[3=\frac{-\,6}{-6-u}\] Þ \[u=-\,4\,cm\]

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