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  3. CEE Kerala Engineering

CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2003

  • question_answer
    The power of the combination of a convex lens of focal length 50 cm and concave lens of focal length 40 cm is:

    A)  \[+1\text{ }D\]                

    B)         \[-1\,D\]            

    C)         zero                     

    D)         \[+\,0.5D\]

    E)  \[-\,0.5D\]

    Correct Answer: E

    Solution :

    \[P={{P}_{1}}+{{P}_{2}}\] \[=\frac{100}{{{f}_{1}}}+\frac{100}{{{f}_{2}}},\]both\[{{f}_{1}}\]and\[{{f}_{2}}\]are in cm. \[=\frac{100}{50}-\frac{100}{40}\] \[=2-2.5=-0.5\,D\]


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