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JEE Main & Advanced Physics Ray Optics Question Bank Spherical Mirror

  • question_answer
    A convex mirror of focal length f forms an image which is \[\frac{1}{n}\] times the object. The distance of the object from the mirror is

    A)            \[(n-1)f\]                               

    B)            \[\left( \frac{n-1}{n} \right)f\]

    C)            \[\left( \frac{n+1}{n} \right)f\]                                        

    D)            \[(n+1)f\]

    Correct Answer: A

    Solution :

                       \[m=+\frac{1}{n}=-\frac{v}{u}\Rightarrow v=-\frac{u}{n}\] By using mirror formula \[\frac{1}{f}=\frac{1}{-\frac{u}{n}}+\frac{1}{u}\] \[\Rightarrow u=-(n-1)f\]


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