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

  • question_answer
    Two lenses of power + 12 and ? 2 diopters are placed in contact. The combined focal length of the combination will be                                                                       [Pb. PET 2004]

    A)            8.33 cm                                   

    B)            1.66 cm

    C)            12.5 cm                                   

    D)            10 cm

    Correct Answer: D

    Solution :

                       \[P={{P}_{1}}+{{P}_{2}}\]\[=+12-2=10D\] Now \[F=\frac{1}{P}=\frac{1}{10}m\]\[=\frac{1}{4}+\frac{1}{-5}=\frac{1}{20}\].


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