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NEET Sample Paper NEET Sample Test Paper-2

  • question_answer
    A liquid of refractive index \[1.33\] is placed between two identical plano-convex lenses, with reference index\[1.50\]. Two possible arrangement, P and Q are shown. The system is:

    A)  Divergent in P, convergent in Q

    B)  Convergent in P, divergent in Q

    C)  Convergent in both

    D)  Divergent in both

    Correct Answer: C

    Solution :

    For arrangement P, \[\frac{1}{{{F}_{eq}}}=\frac{1}{2R}+\frac{1}{2R}-\frac{2}{2R}=\frac{1}{3R}\]  (R = radius of curvature) For arrangement Q, \[\frac{1}{{{F}_{eq}}}=\frac{1}{2R}+\frac{1}{2R}-\frac{1}{3R}=\frac{2}{3R}\] So equivalent focal length for arrangement P is greater than equivalent focal length for arrangement Q and of the same sign i.e., positive.


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