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JEE Main & Advanced Physics Ray Optics Question Bank Spherical Mirror

  • question_answer
    A virtual image three times the size of the object is obtained with a concave mirror of radius of curvature \[36cm.\]The distance of the object from the mirror is          [MP PET 1986]

    A)            \[5cm\]                                  

    B)            \[12cm\]

    C)            \[10cm\]                                

    D)            \[20cm\]

    Correct Answer: B

    Solution :

                       Image is virtual so m = + 3. and \[f=\frac{R}{2}=18\ cm\]            So from \[m=\frac{f}{f-u}\Rightarrow 3=\frac{(-18)}{(-18)-u}\]\[\Rightarrow u=-\ 12\ cm.\]


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