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    Question

    Two lenses of powers +2.0 D and –2.5 D are combined to

    make an optical instrument. The combination will
    A act as a convex lens Correct Answer Incorrect Answer
    B act as a concave lens Correct Answer Incorrect Answer
    C act as a simple mirror Correct Answer Incorrect Answer
    D not form any image Correct Answer Incorrect Answer

    Solution

    The correct answer is B

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