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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 diopter. The combination will behave like

    A) A convergent lens of focal length 50 cm

    B) A divergent lens of focal length 100 cm

    C) A convergent lens of focal length 100 cm

    D) A convergent lens of focal length 200 cm

    Correct Answer: C

    Solution :

    \[\frac{1}{f}=\frac{1}{{{f}_{1}}}+\frac{1}{{{f}_{2}}}=\frac{{{P}_{1}}}{100}+\frac{{{P}_{2}}}{100}=\frac{1}{100}\Rightarrow f=100\]cm           \[\therefore \] A convergent lens of focal length 100 cm.


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