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JEE Main & Advanced Physics Ray Optics Question Bank Spherical Mirror

  • question_answer
    A convex mirror has a focal length\[f.\] A real object is placed at a distance \[f\] in front of it from the pole produces an image at                                                     [AFMC 2005]

    A)            Infinity                                    

    B)            \[f\]

    C)            \[f/2\]                                     

    D)            \[2f\]

    Correct Answer: C

    Solution :

                       Here focal length \[=f\] and \[u=-f\] On putting these values in \[\frac{1}{f}=\frac{1}{u}+\frac{1}{v}\]            \[\Rightarrow \frac{1}{f}=-\frac{1}{f}+\frac{1}{v}\Rightarrow v=\frac{f}{2}\]


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