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JIPMER Jipmer Medical Solved Paper-1995

  • question_answer
    Convex lens of power 4D and a concave lens of power 3D are placed in contact. What is the equivalent power of the combination?            

    A)             \[\frac{3}{4}D\]                                    

    B)             \[7D\]      

    C)                    \[\frac{4}{3}D\]    

    D)                                    \[1D\]

    Correct Answer: D

    Solution :

    Here:     Power of convex lens = 4D Power of concave lens = 3D Hence, die equivalent power of the combination = 4D - 3D = 1D (\[\because \]Concave lens has negative (minus) focal length, so its power will also be negative.)


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