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

  • question_answer
    An object has image thrice of its original size when kept at 8 cm and 16 cm from a convex lens.  Focal length of the lens is                                                                   [UPSEAT 2001]

    A)            8 cm

    B)            16 cm

    C)            Between 8 cm and 16 cm

    D)            Less than 8 cm

    Correct Answer: C

    Solution :

                       m = ± 3, using \[m=\frac{f}{f+u}\] For virtual image \[3=\frac{f}{f-8}\]  .....(i) For real image \[-\,3=\frac{f}{f-16}\]   .....(ii) Solving (i) and (ii) we get \[f=12\,cm\]


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