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

  • question_answer
    A convex lens makes a real image 4 cm long on a screen. When the lens is shifted to a new position without disturbing the object, we again get a real image on the screen which is 16 cm tall. The length of the object must be [MP PET 1991]

    A)            1/4 cm                                    

    B)            8 cm

    C)            12 cm                                      

    D)            20 cm

    Correct Answer: B

    Solution :

               \[O=\sqrt{{{I}_{1}}{{I}_{2}}}=\sqrt{4\times 16}=8\,cm\]


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