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

  • question_answer
    Two thin lenses whose powers are +2D and -4D respectively combine, then the power of combination is [AFMC 1998; CPMT 1996; Very Similar to BHU 2004]

    A) - 2D                                         

    B) + 2D

    C) - 4D                                         

    D) + 4D

    Correct Answer: A

    Solution :

    \[P={{P}_{1}}+{{P}_{2}}=2D-4D=-2D.\]


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