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

  • question_answer
    A lens of power + 2 diopters is placed in contact with a lens of power ? 1 diopoter.  The combination will behave like [UPSEAT 2000]

    A)            A divergent lens of focal length 50 cm

    B)            A convergent lens of focal length 50 cm

    C)            A convergent lens of focal length 100 cm

    D)            A divergent lens of focal length 100 cm

    Correct Answer: C

    Solution :

                       \[P={{P}_{1}}+{{P}_{2}}\Rightarrow P=+2+(-1)=+1D,\]            \[f=\frac{+100}{P}=\frac{+100}{1}=100\,cm\]


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