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  1. Two concave lenses of 60 cm focal length are cemented on either side of a convex lens of 15 cm focal length. The focal length of the combination is
    2. A.

    10 cm
    B.

    20 cm
    C.

    30 cm
    D.

    40 cm

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    Answer : Option C

    Explanation :

    No answer description available for this question.

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