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JEE Main & Advanced Physics Ray Optics Question Bank Spherical Mirror

  • question_answer
    A concave mirror gives an image three times as large as the object placed at a distance of \[20cm\] from it. For the image to be real, the focal length should be [SCRA 1998; JIPMER 2000]

    A)            \[10cm\]                                

    B)            \[15cm\]

    C)            \[20cm\]                                

    D)            \[30cm\]

    Correct Answer: B

    Solution :

               \[m=\frac{f}{f-u}\]\[\Rightarrow -\ 3=\frac{f}{f-(-20)}\]\[\Rightarrow f=-\,15\,cm\]


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