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JEE Main & Advanced Physics Ray Optics Question Bank Spherical Mirror

  • question_answer
    An object 2.5 cm high is placed at a distance of 10 cm   from a concave mirror of radius of curvature 30 cm  The size of the image is                                                      [BVP 2003]

    A)            9.2 cm                                     

    B)            10.5 cm

    C)            5.6 cm                                     

    D)            7.5 cm

    Correct Answer: D

    Solution :

                       \[R=-30\,cm\Rightarrow f=-15\,cm\]                    \[O=+2.5\,cm,\] \[u=-10\,cm\]                    By mirror formula \[\frac{1}{-15}=\frac{1}{v}+\frac{1}{(-10)}\Rightarrow v=30\,cm.\]            Also \[\frac{I}{O}=-\frac{v}{u}\Rightarrow \frac{I}{(+2.5)}=-\frac{30}{(-10)}\]\[\Rightarrow I=+7.5\,cm.\]


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