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

  • question_answer
    A convex lens of power + 6D is placed in contact with a concave lens of power ? 4D.  What is the nature and focal length of the combination                                                  [AMU (Engg.) 1999]

    A)            Concave, 25 cm                   

    B)            Convex, 50 cm

    C)            Concave, 20 cm                   

    D)            Convex, 100 cm

    Correct Answer: B

    Solution :

                       \[P={{P}_{1}}+{{P}_{2}}\Rightarrow P=+\,6-4=+\,2\,D.\] So focal length            \[f=\frac{100}{2}\] = + 50 cm; convex lens


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