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Haryana PMT Haryana PMT Solved Paper-2005

  • question_answer
    An object is placed at a distance 2\[f\]from the pole of a curved mirror (concave or convex) of focal length \[f\] . Then :

    A)  the linear magnification is 1, for both types of curved mirrors

    B)  the linear magnification is 1 for a convex mirror

    C)  the linear magnification is 1/3 for a convex mirror

    D)  none of these

    Correct Answer: B

    Solution :

                    For a curved mirror, when object is placed at 2F, the real image of the same size as , that of object is formed at 2C. So, for a concave mirror                 \[m=\frac{-f}{-f-(-2f)}=-1\] For convex mirror, \[m=\frac{f}{f-(-2f)}=\frac{1}{3}\]


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