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JEE Main & Advanced Physics Ray Optics Question Bank Refraction at Curved Surface

  • question_answer
    The focal length of convex lens is 30 cm and the size of image is quarter of the object, then the object distance is [AFMC 1995]

    A)            150 cm                                    

    B)            60 cm

    C)            30 cm                                      

    D)            40 cm

    Correct Answer: A

    Solution :

               \[m=\frac{f}{f+u}\]\[\Rightarrow -\frac{1}{4}=\frac{30}{30+u}\]\[\Rightarrow u=-150\,cm\]


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