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

  • question_answer
    Two lenses of power 6D and ? 2D are combined to form a single lens. The focal length of this lens will be [MP PET 2003]

    A)            \[\frac{3}{2}\] m                 

    B)            \[\frac{1}{4}\]\[m\]

    C)            4 m

    D)             \[\frac{1}{8}\]\[m\]

    Correct Answer: B

    Solution :

               Combined power \[P={{P}_{1}}+{{P}_{2}}=6-2=4D\]. So focal length of combination \[F=\frac{1}{P}=\frac{1}{4}m\]


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